(1) 弱的
weak: applies to deficiency or inferiority of strength or power of any sort: a ~ government likely to topple soon.   deficient缺乏的 inferior较差的


feeble: suggests extreme weakness inviting pity or disdain: a ~ attempt to resist the enemy attack.


frail: implies delicacy and slightness of constitution or structure and liability to failure or destruction: a once robust man now ~ with disease.


fragile: suggests frailty, inability to resist rough usage, and liability to destruction: a ~ beauty that the camera can't convey.   解释fragile的三个关键词都以ty结尾


infirm: suggests instability, unsoundness, and insecurity due to loss of strength from old age, crippling disease, or temperamental vacillation: an ~ old woman confined to her home.


decrepit: implies being worn-out or broken down from long use or old age: the ~ butler had been with the family for years.


weak弱的: 泛指缺乏力量，feeble极弱: 极度虚弱，令人可怜或轻视，frail脆弱: 质地单薄容易损坏，fragile脆弱: 同样表示不耐用易损坏，infirm体弱、不坚定: 不健康不坚定，由于年老疾病性格摇摆，decrepit破旧、衰老: 由于长期使用或年老


记忆方法: 1) 首字母WFFFID排列成DIFF(不同) FW(服务)，需要不同的服务<==弱的    弱表示"弓无力"，弓下方的两点像是羽毛，本义是"气力小、势力差"

          2) 弱的的意思是不能承受紧张压力努力mean not strong enough to endure strain, pressure, or strenuous effort.首字母WFFFID排列成DIFF(不同) FW(服务)，需要不同的服务<==弱的     (strenuous 1、奋力 2、费力)


(2) 削弱
weaken: may imply the loss of physical strength, health, soundness, or stability or of quality, intensity, or effective power: a disease that ~s the body's defenses against infection.


enfeeble: implies an obvious and pitiable weakening to the point of helplessness: so ~d by arthritis that he requires constant care.


debilitate: suggests a less marked or more temporary impairment of strength or vitality: the operation has a temporary ~ing effect.   impair损害(健康记忆听力视力等)


undermine: suggests a weakening by something working surreptitiously or insidiously and implies a caving in or breaking down: a poor diet ~s your health.   (surreptitious鬼鬼祟祟，悄悄，常违反法律习俗，如he made a surreptitious entrance to the club他鬼鬼祟祟的进了俱乐部) (insidious: 潜藏但有害，如an insidious enemy阴险敌人)   (cave in塌陷，break down倒塌)


sap: is close to undermine but adds a suggestion of a draining of strength: drugs had ~ped his ability to think.   又如the illness/failure sapped him of his strength/confidence疾病/失败耗尽了他的力量/信心


cripple: implies the causing of a serious loss of functioning power through damaging or removing an essential part or element: inflation had ~d the economy.


disable: suggests a usually sudden crippling or enfeebling of strength or competence: ~d soldiers received an immediate discharge.


weaken削弱: 泛指丧失力量(力量健康稳定或属性强度效力)，enfeeble削弱: 削弱到可怜无助的地步，debilitate削弱: 暂时的相对的削弱，undermine削弱: 悄悄的隐藏的削弱，可能造成塌陷或倒塌，sap耗尽: 接近undermine，但表示耗尽力量，cripple使残疾: 严重丧失基本功能或组成部分，disable使残疾、无效: 表示突然的致残或丧失能力


记忆方法: 1) 首字母WEDUSCD排序为DUDE(男人)和SWC(食物差)<==削弱力量   dude是美国俚语，表示man男人，年轻人常使用，如my doctor is a cool dude是一位酷男

          2) 削弱的意思是使丧失力量能量活力mean to lose or cause to lose strength, energy, or vigor.首字母WEDUSCD排序为DUDE(男人)和SWC(食物差)<==削弱力量