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但这词比较文气，日常用help时更多一些。
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107 assure—ensure—insure
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assure表示“向（某人）保证”、“肯定地说”：
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I assure you that this medicine cannot harm you．我向你保证这药对你没有害处。
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They assured the passengers that there was no danger．他们向乘客保证，没有危险。
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I assure you I need you．我向你肯定地说我需要你。
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I assure you that you’re mistaken．我肯定地说你错了。
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也可用于assure of这个短语中：
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I assure you of my full support for your plan．我向你保证全力支持你的计划。
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They assured us of his ability to work．他们向我们保证他有能力工作。
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I assured him of our affection．我向他肯定地说我们是爱他的。
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ensure表示“保证（有）”、“使一定得到”：
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I can’t ensure that he will be there in time．我不能保证他能准时到达。
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Come early to ensure getting a good seat．早些来以确保有好座位。
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This medicine will ensure you a good night’s sleep．这种药可以确保你睡一夜好觉。
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His reputation was enough to ensure that he was always welcome．他的名望足以保证他随时会受到欢迎。
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One more touchdown will ensure (insure) victory．再进一球可确保获胜。
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insure表示“给……保险”：
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She insured her car against theft．她给车买了防盗险。
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He insured the house for $40,000．他给房子买了40000美元的保险。
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Are you insuring against fire？你保火险了吗？
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Insure your baggage before you leave home．离家前给行李买保险。
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在美式英语中，insure也可表示“确保”：
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I shall try to insure that your stay is a pleasant one．我将设法确保你待得很愉快。
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