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2024年9月4日 · water pollution, the release of substances into subsurface groundwater or into lakes, streams, rivers, estuaries, and oceans to the point that the substances interfere with beneficial use of the water or with the natural functioning of ecosystems.
2024年9月5日 · sustainable development, approach to social, economic, and environmental planning that attempts to balance the social and economic needs of present and future human generations with the imperative of preserving, or preventing undue damage to, the natural environment.
1 天前 · China is a country of East Asia. It is the largest of all Asian countries and has one of the largest populations of any country in the world. Occupying nearly the entire East Asian landmass, it covers approximately one-fourteenth of the land area of Earth. Learn more about China, including its history and culture.
On This Day In History: anniversaries, birthdays, major events, and time capsules. This day's facts in the arts, politics, and sciences. American railroad foreman Phineas Gage suffered a traumatic brain injury when an iron rod shot through his skull and obliterated the greater part of the left frontal lobe of his brain; he survived with apparently no lasting physical damage, though some ...
3 天前 · Clear and simple definitions in American English from Britannica's language experts. More usage examples than any other dictionary.
2024年7月24日 · Water cycle, cycle that involves the continuous circulation of water in the Earth-atmosphere system. Of the many processes involved in the water cycle, the most important are evaporation, transpiration, condensation, precipitation, and runoff. The total amount of water remains essentially constant.
4 天前 · science, any system of knowledge that is concerned with the physical world and its phenomena and that entails unbiased observations and systematic experimentation. In general, a science involves a pursuit of knowledge covering general truths or the operations of fundamental laws.
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