undermine/sap/weaken.导航词义：逐渐削弱

1. undermine:v. 逐渐削弱，损害.尤指使信心、权威等变弱或失去效力。

These limitations may undermine the health care system.

这些限制可能会损害医疗保健制度。

The supporters' confidence in the government has been undermined by several recent scandals.

最近几次丑闻已动摇了支持者对政府的信心。

The constant criticism has undermined her position.

不断的批评已经损害了他的地位。

2. sap:v. 削弱，逐渐破坏.尤指逐渐削弱某人的力量、信心、意志等。

The hot sun sapped the energy of the marathon runners.

火辣辣的太阳烤得那些马拉松选手虚软无力。

Years of failures in the elections have sapped him of his confidence.

连年竞选失败使他逐渐丧失了自信。

3. weaken:v. 削弱；使虚弱；动摇.指使某人或某物变得不重要或不强大，或使人身体衰弱，也可指动摇某人的决心。

He did it to weaken the manager's position.

他这么做是为了削弱经理的地位。

The new evidence has weakened the case against the accused.

新的证据削弱了对被告的指控力度。

The children were weakened by lack of essential nutrients for a long time.

那些孩子因为长期营养不良而身体衰弱。

These policies have weakened the resolve of potential house buyers.

这些政策动摇了潜在购房者的决心。

全部

1·Nothing could weaken his resolve to continue.

什么也不能削弱他继续下去的决心。《牛津词典》

2·He accused them of conniving with foreign companies to weaken employment rights.

他指控他们与外国公司共谋来削弱雇用权。《柯林斯英汉双解大词典》

3·There was one caveat: he was not to enter into a merger or otherwise weaken the Roche family's control of the firm.

提醒一下：他不是要参与并购或其他削弱罗技家族对该公司控制的行动。《柯林斯英汉双解大词典》

4·He sees that warm water flows back eastwards when winds that normally blow westwards weaken, or sometimes the other way round.

他发现，当通常向西吹的风减弱时，温暖的海水就会向东流回，有时反之亦然。

5·Forgetting clearly aids orientation in time, since old memories weaken and the new tend to stand out, providing clues for inferring duration.

遗忘显然有助于时间的定位，因为旧的记忆会减弱，新的记忆会突显出来，从而为推断持续的时间提供线索。

6·She felt her legs weaken.

她觉得两腿无力。《牛津词典》

7·You must not agree to do it. Don't weaken.

你们一定不能同意做这件事。别心软。《牛津词典》

8·Even injuries did not weaken his desire.

即使是伤病也没有削弱他的欲望。

9·Such commitment can also weaken a sense of freedom.

这种投入也会削弱自由的感觉。

10·Don't you ever weaken, Huck, and I won't.

你不会动摇的，哈克，我也不会的。

削弱

1·Nothing could weaken his resolve to continue.

什么也不能削弱他继续下去的决心。《牛津词典》

2·He accused them of conniving with foreign companies to weaken employment rights.

他指控他们与外国公司共谋来削弱雇用权。《柯林斯英汉双解大词典》

3·There was one caveat: he was not to enter into a merger or otherwise weaken the Roche family's control of the firm.

提醒一下：他不是要参与并购或其他削弱罗技家族对该公司控制的行动。《柯林斯英汉双解大词典》

4·In any case, cash gifts can weaken the resolve of even the noblest person.

在任何情况下，即使是最高贵的人，现金礼物也会削弱他的决心。

5·Environmentalists offer theirs, which too often amount to naive wish lists that could weaken American's growth.

环保主义者给出了他们的建议，这些建议往往是天真的愿望清单，而且会削弱美国的发展。

减弱

1·He sees that warm water flows back eastwards when winds that normally blow westwards weaken, or sometimes the other way round.

他发现，当通常向西吹的风减弱时，温暖的海水就会向东流回，有时反之亦然。

2·The center says the pattern should begin to weaken in a week or two.

该中心说这一走势应该会在一两周后开始减弱。

3·Sleeping longer than you need to will weaken your sleep system, as you reduce your prior wakefulness, exposure to sunlight, activity levels, and your body temperature at a low for too long.

睡得比你所需应该睡的时间长了会减弱你的睡眠系统，当你降低了你先前的觉醒度，暴露于阳光中，你的活动水平和你的身体体温都处于低水平太久。

4·But the accused may seek to weaken his evidence by arguing that he has a chip on his shoulder.

被告辩论说他肩上有个芯片，可能会想方设法减弱他的证据力度。

5·There is little to weaken them, for these far southern latitudes circumscribe the entire globe almost without interruption by land.

这些极南边的纬度地区在整个地球版图中，是几乎毫无障碍一马平川的陆地，所以风力几乎不会减弱。

弱化

1·When writing itself appeared, philosophers feared that it would weaken memory and degrade intelligence .

当书写自身出现时，哲学家担心它会弱化记忆和损害智力。

2·The finance minister, Yoshihiko Noda, said he expects the actions to weaken the yen and improve the economy.

日本财务大臣野田佳彦称他希望这些行动可以弱化日元并且能改善经济。

3·The best that can be hoped for is that it does not weaken its collective security guarantee by discussing it to death.

如今最好的期冀就是北约不会使集体安全保障讨论进入僵局，从而弱化该议题。

4·It can also corrode and weaken the shell over time.

而且时间长了也还腐蚀弱化龟壳。

5·The record growth in national debt will force some countries toward fiscal consolidation in the not-so-distant future, though tax hikes could weaken a recovery of private demand.

在不久的未来，尽管加税可能弱化私人需求的复苏，但创纪录的国债增长将迫使一些国家努力稳定财政。

减少

1·The application of ribbon charge (placed in tunnel)in twin slope - cut chamberblasting can weaken the damage to slope rock from blasting.

在双路堑洞室爆破中应用条形药包可以减少爆破对边坡岩体的损伤。

变弱

1·If you don't use the muscles, they will weaken, and shorten and resist repair.

如果不使用肌肉，它们就会变弱、变短并对修复产生抗拒。

2·At body temperature, the polymer-water bonds weaken, and the polymer molecules prefer to bond with each other.

体温下聚合物和水之间的化学键变弱，聚合物分子彼此更易于成键。

3·The soft tissues in the voice box (larynx) weaken, affecting the pitch, loudness and quality of the voice.

喉部的软组织变弱，影响声调、音量和音质。

4·The right knee pain upon sudden standing up from sitting position is due to the instability of the knee joint most likely resulted from weaken muscle power around the knee.

坐下后突然站起来导致右腿膝盖痛，是因为膝盖的周围肌力变弱而引起膝关节不稳定所致的。

消弱

1·Starting in the late 1970s the middle class began to weaken.

上世纪70年代，中产阶级开始消弱。

2·Starting in the late 1970s, the middle class began to weaken.

上世纪70年代，中产阶级开始消弱。

3·The base bleed has two contrary action of providing energy and ejection, and it can weaken the effect of lateral jet upon base flow.

底喷流动具有添质加能和引射两种相反作用，并能消弱侧喷流对弹丸底部流动的影响。