核心问题
请简析 ensure 与 insure。
词典解答
ensure 的意思是：“保证”“使肯定得到”：
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This medicine will ensure you a good night's sleep. (LDCE) 这药肯定会使你夜里睡得很好。
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These factors must be adjusted rapidly to ensure maximum propulsive efficiency. 这些因素必须迅速加以调整以确保最大的推进效率。
insure 则总是与“保险”有关系: insure one's life, property, insure against fire/death, accident:
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My house is insured against fire. (LDCE) 我的房子保了火险。
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They were advised to insure their luggage against theft. 有人建议他们给行李保被盗险。但是美国英语有一种倾向，就是把 ensure 也拼写为 insure。