像咖啡因这类温和的兴奋剂可以产生情境依靠提高学习——所以如果你学习时喝咖啡或碳酸水，那么考试时也要喝。
Stimulants as mild as caffeine can produce state-dependent learning boosts — so if you drink coffee or soda while studying, drink them before the test, too.
最为常见的是因摄入被污染的水或食物，导致小肠被特定细菌如霍乱或大肠杆菌的某些菌株感染。
The most common, by far, is infestation of the small intestine by certain bacteria, such as cholera or certain strains of E. coli, following ingestion of contaminated water or food.
山崩可能地震引起，也可能发生在大雨后或雪后因泥土浸满了水而引起。
This might be caused by an earthquake or it might happen after a heavy rain or when soil becomes waterlogged after a fall of snow.
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