decline，be on the wane，go downhill，fading，break up ；

[例句] 由于越来越难以收回成本，可可产业日渐衰落。 The cocoa industry dwindled because it became increasingly difficult to cover costs.

[例句] 美元的衰落给总是担惊受怕的投资者们带来了信心。 The declining dollar gave heart to skittish investors.

attenuation，decay，damping，reduction ；

[例句] 她想成为艺术家的梦想由于视力衰减而破灭了。 Her ambition to become an artist was thwarted by failing eyesight.

[例句] 毒性已衰减的病毒 an attenuated form of the virus

weak，feeble，collapse，traik，crack-up ；

[例句] 眼见自己的身体日渐衰弱真是让人心烦。 To see my body literally wither away before my eyes was exasperating.

[例句] 该技术是把健康细胞注射到衰弱的肌肉里面。 The technique consists of injecting healthy cells into the weakened muscles.

decay，disintegration，alpha decay ；

[例句] 雅各布森得出的结论是基于对钐-147衰变成钕-143所作的分析。 Jacobsen based his conclusion on an analysis of the decay of samarium-147 into neodymium-143.

[例句] 与氦 - 4不同之处是, 氦-3不能由放射性衰变产生. Unlike helium - 4, it cannot be produced by radioactive decay.

slow death，grow old，go out，senility，caducity ；

[例句] 饮食中摄入过量蛋白质可能会加速衰老。 Too much protein in the diet may advance the ageing process.

[例句] 他58岁，身体正在迅速衰老。 He was 58, and his health was failing rapidly.

fail，decline，decay，rust，at low ebb ；

[例句] 我们正在经历现代最严重的一段经济衰退。 We are in one of the most severe recessions in modern times.

[例句] 投资可能会中断，而这会引起经济衰退。 Investment could dry up and that could cause the economy to falter.

weak and degenerate，be on the wane ；

[例句] 他的精力渐渐衰颓. His strength is waning.

[例句] 年岁使他衰颓. His years weigh him down.

collapse，failure，exhaustion，prostration，crock up ；

[例句] 最后，他的胃和肺衰竭了。 In the end it was his stomach and lungs that packed up.

[例句] 老妇人的体力在渐渐衰竭. The old lady's strength is draining away.

decline，wane，be on the wane，fall into decay，at a low ebb ；

[例句] 存在城市衰败和帮派暴力的问题。 There are problems of urban decay and gang violence.

[例句] 大惊小怪的人常把新兴的一代看作衰败的一代. Alarmists usually regard the rising generation as a falling one.

[书] decline，wane，decadency，declination ；

[例句] 英国明星的影响力好像日渐衰微. The star power of British celebrities to be on the wane.

[例句] 岁月悠悠,衰微只及肌肤; 热忱抛却,颓唐必致灵魂. Years wrinkle the skin, but up enthusiasm wrinkle the soul.

[计] attenuation pad，[化] attenuator，dimmer ；

[例句] 这种薄膜衰减器系列具有卓越的高频特性. This thin film attenuator series exhibit excellent high frequency characteristics.

[例句] 利用上述方法研制出了完整封装的SOI基可变光学衰减器样品. SOI - based VOA devices are packaged for the first time.

anile，decrepit，[医] senescent，senile，doddery ；

[例句] 雨水从他那带有疤痕的衰老的双颊滚滚流下. The rain runs in streams down his scarred old cheeks.

[例句] 巴尔多伸出了他那衰老的白手. Bardo had stretched out his aged white hand.

feeble，weak，hyposthenic，broken-down，enervate ；

[例句] 该技术是把健康细胞注射到衰弱的肌肉里面。 The technique consists of injecting healthy cells into the weakened muscles.

[例句] 衰弱的老人 a feeble old man

[书] feeble and decaying，decrepit ；

[例句] 曾有一位著名的心理学家说过,很多人 “ 在25 岁 时就达到了衰朽的年龄了 ”. A great psychologist said that most men are " old fogies at twenty - five . "

[例句] 第14章强调说,复兴开始的时候正是衰朽达到极端的时候. Chapter 14 argues that a renaissance is bound to occur when decadence has reached an extreme.

winter，[医] decline，phase of decline，wane ；

[例句] 在经济衰退期，制造业有很多人失业了。 Many jobs in manufacturing were lost during the recession.

[例句] 许多小银行在经济衰退期破了产. Many small banks failed during the recession.

deteriorative，recessionary ；

[例句] 利率的下调将有助于缓解经济衰退的压力。 Reduced interest rates would help ease recessionary pressures in the economy.

[例句] 许多房屋的卖主仍然陷在经济衰退的困境中。 Many home sellers remain stuck in a recessional rut.

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[例句] 大惊小怪的人常把新兴的一代看作衰败的一代. Alarmists usually regard the rising generation as a falling one.

[例句] 国会已试行过数十种方法来重振正在走向衰败的城乡地区。 Congress has tried dozens of approaches to revitalize decaying urban and rural areas.

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[例句] 矿山的关闭是这个镇衰落的唯一最重要的因素。 The closure of the mine was the single most important factor in the town's decline.

[例句] 那个帝国何时开始衰落的? When did the empire begin to wane?

decline，be on the wane，downhearted，disheartened ；

decadent，effete ；

[例句] 他的相伴使我可以摆脱日渐衰微的敏感. His companionship made it possible for me to shake off my sensitiveness.