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(1)反應(yīng)(action，feeling or attitude aroused by sth)[C，U][N(to)]：What was the critic's～to the book? 評論家對那本書的反應(yīng)如何?～s to the suggestions/sb's remarks/a joke/hearing what has happened 對那個建議/某人的話/一個玩笑/聽到所發(fā)生的事情所作的反應(yīng);evoke/produce powerful (immediate)～s among the audience (in the young people) 在聽眾(年輕人)中引起/產(chǎn)生巨大的(即刻)的反響;Our～s get slower as we get older. 年齡越大，反應(yīng)越慢?！纪絩esponse，reply;

(2)(藥物等引起的)反應(yīng)(any effect produced by a chemical substance or the action of a drug)[C;U，a～][N(to)]：Have you had a～to your injection? 你打針后有什么反應(yīng)? a bad～to penicillin/certain tests/the drug 對青霉素/某些試驗/那種藥物的不良反應(yīng);an allergic～to pollen/birds/animals 對花粉/鳥類/動物過敏;produce no evil～不會產(chǎn)生不良反應(yīng);

(3)反作用力(force that balances opposite force)[C，U，a～]：action and～作用和反作用;rocket～火箭推力;the mutual～on each other of character and environment 性格與環(huán)境的相互作用;

(4)相反的感覺(傾向)(change of opinions or feeling，esp a return to an earlier condition)[U，a～]：This made him popular for a time，but then (a)～set in. 這使他一時間很受歡迎，但后來人們就不那么喜歡他了。There is a healthy～after swimming in winter. 冬天游泳后，會很健康的。

(5)反動(對)(opposition to political change，desire to return to a former system)[U][N(against)]：～against the new developments in the industry 對工業(yè)新發(fā)展的反對;Once again the forces of～prevailed/were de-feated. 反動勢力再次囂張/被擊敗了。

(6)化學(xué)(核)反應(yīng)(process or condition of taking part in a chemical change;chemical changes)[C，U]：A chemical～occurs in the fuel cell. 燃燒室里發(fā)生化學(xué)反應(yīng)。organic/nuclear/positive/negative～有機/核/陽性/陰性反應(yīng);

← re′act v;

→ re′actionary adj 反動的;n 反動分子