| ugly and threatening weather |
险恶天气 |
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| ultrafiltration (Separation of colloidal or very fine solid materials by filtration through microporous or semipermeable mediums) |
超滤 |
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| ultrasound (Sound waves having a frequency above about 20,000 hertz) |
超声波 |
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| ultrastructural reorganization |
超微结构重组 |
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| ultraviolet radiation (The part of the electromagnetic spectrum with wavelengths shorter than light but longer than x-rays; in the range of 4-400 nm) |
紫外线 |
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| unauthorized dump |
城镇粪便堆存处 |
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| unauthorized dump |
未经认可的堆存处 |
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| UNCED (United Nations Conference on Environment and Development, Rio de Janeiro, Brazil, 1992) |
联合国环境与发展大会 |
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| uncontrolled dump (Place where waste is left on the ground and not buried in a hole) |
未受控制的垃圾场 |
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| underground disposal (The discharge, dumping or emission of wastes below the surface of the soil) |
地下处理 |
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| underground dump (Any subterranean or below-ground site in which solid, or other, waste is deposited without environmental controls) |
地下垃圾站 |
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| Underground Injection Control (program) |
|
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| underground quarry (Quarry located below the surface of the earth) |
地下采石场 |
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| underground railway (An electric passenger railway operated in underground tunnels) |
地下铁路 |
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| underground sources of drinking water |
地下饮用水源 |
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| underground storage (Storage located underground designed to hold gasoline or other petroleum products or chemical solutions) |
地下储存 |
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| underground train (A train for transportation of people, mostly beneath the surface of the ground, in order to lessen the traffic) |
地铁列车 |
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| underprivileged people (A segment of the population that does not have access to the rights or benefits granted to the rest of society, often because of low economic or social status) |
弱势群体 |
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| undertaking business (Any commercial activity, position or site associated with the preparation of the dead for burial and the management and arrangement of funerals) |
殡葬业 |
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| underwater outlet (Point of water disposal located below the sea surface) |
水下排水口 |
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