最近几次爆发的霍乱是一个适时的提醒，该疾病依然是个严重的健康危害。
The recent outbreaks of cholera are a timely reminder that this disease is still a serious health hazard.
在森林里，有一只危害很大的独角兽，你必须先抓住它。
In the forest roams a unicorn which does great harm, and you must catch it first.
这些植物中有一些较其他的易受霜冻危害。
Some of these plants are more susceptible to frost damage than others.
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