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(1) 保證，擔(dān)保 (make sure or certain of; guarantee) [T+n，T+that，T+n+ prep(of)]：～a good harvest/a favourable outcome to the negotiations/one's success 保證好收成/談判獲得有利的結(jié)果/某人獲得成功; Come early to～ getting a good seat. 早點來以便確保找到好座位。 take measures to～good health and safety 采取措施以保證健康和安全; You must～that your television set is switched off at night/that you will arrive on time every day/that the work shall be done in the right way. 在夜里你一定要把電視機關(guān)上/每天都必須準時到/一定要把這項工作做好?！玱neself of a good income 使自己獲得高收入; 〖同〗 assure，guarantee，secure;

(2) 保證獲得(有) (make sure of getting; secure) [T+n，D+n+n]： ～sb a good night's sleep/a good pass in the examination/an interview 保證晚上睡個好覺/考出好成績/得到會見;He wrote one poem which～d his undying fame. 他寫了一首詩，這使他得以獲得不朽的聲譽。These documents～to you the authority you need. 這些文件保證讓你得到你所需要的權(quán)力。〖同〗 assure，secure;

(3) 保護，使安全，防止 (make safe; protect; guarantee against risk) [T+n+prep(against/from)]：～sb/oneself against (from) harm/danger 使某人/自己不受傷害/避開危險;～freedom against tyranny 確保自由不被暴君毀掉; Vaccination～s one against disease. 接種疫苗可以使人不得疾病?！纪?protect，guard，safeguard，secure;

→ en′surer n 保證人;

【注意】ensure和insure 都可以表示保證，如： ensure (or insure) victory (確保勝利)，但如果表示為生命或財產(chǎn)保險，則只能用 insure， 如：have one's house insured (為房子上保險);

【辨異】ensure與assure和insure的區(qū)別見ASSURE。