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  1. 2024年4月27日 · VPN, a private computer network deployed over a public telecommunications network, such as the Internet. A VPN typically includes one or more connected corporate intranets, or local area networks (LANs), which users at remote locations can access using a

    • The Editors of Encyclopaedia Britannica
    • Overview
    • Relief
    • Drainage
    • Soils

    Hong Kong, special administrative region (Pinyin: tebie xingzhengqu; Wade-Giles romanization: t’e-pieh hsing-cheng-ch’ü) of China, located to the east of the Pearl River (Zhu Jiang) estuary on the south coast of China. The region is bordered by Guangdong province to the north and the South China Sea to the east, south, and west. It consists of Hong Kong Island, originally ceded by China to Great Britain in 1842, the southern part of the Kowloon Peninsula and Stonecutters (Ngong Shuen) Island (now joined to the mainland), ceded in 1860, and the New Territories, which include the mainland area lying largely to the north, together with 230 large and small offshore islands—all of which were leased from China for 99 years from 1898 to 1997. The Chinese-British joint declaration signed on December 19, 1984, paved the way for the entire territory to be returned to China, which occurred July 1, 1997.

    The area of Hong Kong (Pinyin: Xianggang; Wade-Giles: Hsiang-kang) has expanded over the years, and it has continued to grow as more land has been reclaimed from the surrounding sea. Hong Kong Island and its adjacent islets have an area of only about 31 square miles (81 square km), while urban Kowloon, which includes the Kowloon Peninsula south of Boundary Street, and Stonecutters Island measure about 18 square miles (47 square km). The New Territories account for the rest of the area—more than 90 percent of the total. The Victoria urban district located on the barren rocks of the northwestern coast of Hong Kong Island is the place where the British first landed in 1841, and it has since been the centre of administrative and economic activities.

    Hong Kong has rugged relief and marked variations in topography, which is in sharp contrast to the low-lying areas of the Pearl River Delta region but conforms geologically and structurally to the well-eroded upland region of the great South China massif. Structurally, the area is an upfold, running northeast-southwest, that was formed about 150 million years ago toward the latter part of the Jurassic Period. Lava poured into this structure and formed volcanic rocks that were later intruded by an extensive granitic dome. The harbour of Hong Kong was formed by the drowning of the denuded centre of the dome. The surrounding hills on the mainland and on Hong Kong Island are partly capped by volcanic rocks, and steep, scarplike concave slopes lead to the inner harbour.

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    The area is a partially submerged, dissected upland terrain that rises abruptly to heights above 2,950 feet (900 metres); its backbone is made up of a series of ridges, running northeast to southwest, that tie in closely with the structural trend in South China. This trend is clearly observable from the alignment of Lantau Island and the Tolo Channel. From Mount Tai Mo—at 3,140 feet (957 metres) the highest peak in the territory—the series of ridges extends southwestward to Lantau Island, where the terrain rises to 3,064 feet (934 metres) on Lantau Peak and 2,851 feet (869 metres) on Sunset Peak. Extending southeastward from Mount Tai Mo, the Kowloon Peak attains an elevation of 1,975 feet (602 metres), but there is an abrupt drop to about 650 feet (198 metres) at Devil’s Peak. Victoria (Hong Kong) Harbour is well protected by mountains on Hong Kong Island that include Victoria Peak in the west, which rises to 1,810 feet (552 metres), and Mount Parker in the east, which reaches a height of about 1,742 feet (531 metres).

    Lowlands of the Hong Kong region, including floodplains, river valleys, and reclaimed land, occupy less than one-fifth of the land. Extensive lowland regions are found only north of Mount Tai Mo, in the Yuen Long and Sheung Shui plains. The urban area that spans the two sides of the harbour, with ongoing reclamation, takes up only about one-tenth of the level area.

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    Hong Kong lacks a river system of any scope, the only exception being in the north where the Sham Chun (Shenzhen) River, which forms the boundary between Guangdong and Hong Kong, flows into Deep Bay after collecting a number of small tributaries. Most of the streams are small, and they generally run perpendicular to the northeast-southwest trend of...

    In general, Hong Kong’s soils are acidic and of low fertility. An exception is the alluvial soils, which are found mainly in the Deep Bay area, where the sediment-laden waters of the Pearl River estuary meet saline waters at high tide and slow down to deposit their sediments to form mudflats. Paddy rice farming and, more recently, intensive vegetab...

    • Chi-Keung Leung
  2. 4 天前 · Internet, a system architecture that has revolutionized mass communication, mass media, and commerce by allowing various computer networks around the world to interconnect. Sometimes referred to as a “network of networks,” the Internet emerged in the United States in the 1970s but did not become visible to the general public until the early ...

  3. Date: July 1, 1997. handover of Hong Kong, transfer of the British crown colony of Hong Kong to Chinese sovereignty, ending 156 years of British rule. After a formal handover ceremony on July 1, 1997, the colony became the Hong Kong special administrative region (HKSAR) of the People’s Republic of China. The handover ceremony culminated a 13 ...

  4. 2024年5月6日 · May 6, 2024, 7:36 AM ET (Tech Xplore) Computer scientists discover gap in the latest security mechanisms used by some chips. cloud computing, method of running application software and storing related data in central computer systems and providing customers or other users access to them through the Internet.

  5. 2024年5月3日 · Guangzhou, city, capital of Guangdong sheng (province), southern China. Its city centre lies near the head of the Pearl River (Zhu Jiang) Delta, more than 90 miles (145 km) inland from the South China Sea. Because of its position at the meeting point of inland rivers and the sea, it has long been one of China’s main commercial and trading ...

  6. 2024年4月29日 · Sand dunes in the Sahara, near Merzouga, Morocco. The Sahara is the world's largest desert; it extends across most of the northern part of Africa. Sahara, (from Arabic ṣaḥrāʾ, “desert”) largest desert in the world. Filling nearly all of northern Africa, it measures approximately 3,000 miles (4,800 km) from east to west and between 800 ...

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