Once Endris was back in his Marina apartment, he began having a recurring nightmare: the great white shark plowing through the water, about to knock him off his board.

当Endris回到他在码头的公寓时，就开始连环的噩梦：大白鲨在水中翻腾，要把他从冲浪板上打下来。

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Rinse surfaces once through with DI water until conductivity of inlet and outlet fluids are within tolerances.

用去离子水单次使用冲洗表面直到入口和出口的液体的电导率在容许范围内。

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At the same time, once the surface water infiltration wall in soil, can be discharged through the masonry quickly, effectively reduce the ground water level.

同时，地表水一旦入渗墙后土中，则可以通过砌体较快地排出，有效降低地下水位。

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Once emitted, it persists in the environment for a long time - circulating through air, water, soil and living organisms - and can be dispersed over vast distances.

BBC: Nations agree on legally binding mercury rules

It is spread through infected faeces and, once it enters the water supply, it is difficult to stop - especially in a country like Haiti which has almost no effective sewage disposal systems.

BBC: UN launches appeal to fight Haiti cholera epidemic