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714 precaution—prevention
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precaution指“预防措施”（可数）：
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The doctor would like you to be vaccinated as a precaution．医生希望你打针作为预防措施。
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Take every precaution so as not to catch cold．采取一切预防措施以免感冒。
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Take precaution against burglary (fire)．采取防盗（火）措施。
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prevention表示“预防”、“防止”（不可数）：
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prevention is better than cure．防病胜于治病。（谚语）
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prevention of forest fires is up to you．防止森林火灾你有责任。
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prevention of disease is one of the duties of the government health officers．预防疾病是政府卫生官员的职责之一。
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715 prefer—preferable
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prefer是动词，表示“宁愿”、“更喜欢（愿意）”，可跟以下几种结构。
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跟名词和代词：
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1704953049
I prefer the view taken by Balzac．我更赞成巴尔扎克的意见。
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1704953051
Which do you prefer？你更喜欢哪一个？
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跟不定式：
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1704953055
She prefers to live among the working people．她更喜欢生活在劳动人民中间。
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1704953057
At the moment, he preferred not to think about the future．此刻他宁愿不想未来。
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跟动名词：
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I prefer standing．我宁愿站着。
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Oh, I prefer being alone．啊，我宁愿一个人待着。
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跟带不定式的复合结构：
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Cyril preferred her not to come．西里尔宁愿她不来。
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They preferred the matter to be discussed at the next meeting．他们更愿意下次会上再讨论这件事。
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跟从句：
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