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v (使)減小(少，弱)，(使)降低((cause to) become less in size， number， amount， strength or quantity) [I， T+n]：The percentage of old workers/Interest in sports is～ing. 老工人的比率/對(duì)運(yùn)動(dòng)的興趣在降低。The swelling/cold has～d. 消腫了/寒冷減弱了。Student numbers have～d by 1000/10 percent. 學(xué)生人數(shù)減少了1000/10%。Profits have～d over last year. 利潤(rùn)比去年減少了。Our sales/Water consumption/The supply of food～d last summer. 去年夏天我們的銷(xiāo)售量/耗水量/食品供應(yīng)減少了。～sb's wages/the cost of production/the temperature in the room 降低某人的工資/生產(chǎn)成本/室內(nèi)溫度;～the dose of medicine/the swelling/the speed 減小藥的劑量/消腫/減慢速度;(university)～the number of students(大學(xué))減少學(xué)生人數(shù);(government)～imports(政府)減少進(jìn)口;〖同〗lessen， reduce;〖反〗increase，enlarge;

n(1) 減小(少，弱)，降低(act or process of decreasing; reduction) [U] [N(in)]： some～in the crime rate犯罪率一定程度的降低;〖同〗lessening， reduction;〖反〗growth， increase;

(2) 減少之量(amount by which sth decreases) [C][N(in/of)]：There has been a (gradual/big)～in the number of boys/population/sales/imports. 男孩數(shù)/人口/銷(xiāo)售量/進(jìn)口額(逐漸/大大)減少了。There has been a(20%)～in production/unemployment. 生產(chǎn)/失業(yè)減少了(20%)。There was a～of heat. 炎熱程度降低了。a～of 30 percent/of over 1000減少30%/1000多;〖反〗increase;

on the decrease 在減少：The demand for tea/crime is on the～. 茶的需求/犯罪在減少。

【辨異】decrease與reduce和shrink都可表示數(shù)量變少(小)。decrease指尺寸、體積、數(shù)量上逐漸地、持續(xù)地減少(小)，常常是因?yàn)槟撤N不可覺(jué)察的原因或固有的過(guò)程，如：The swelling～d daily.(腫脹一天天地消下去。) reduce(使減少(小)，使降低)指人為的減少(小)，一般只用作vt，如： reduce the weight of sth(減少……的重量);shrink(縮小，收縮)指由于固有特性在特有的條件下縮小，如：Many fabrics shrink in hot water.(許多織物在熱水中收縮。) 還有diminish((使)減小，(使)顯得小)通常指外部原因造成的不斷減少，如：Evaporation caused the water in the pool to diminish.(蒸發(fā)使池塘里的水減少。)