weaken

• Some retarders permanently weaken the concrete .
  某些缓凝剂对混凝土起长期的弱化作用。
• You cannot strengthen the weak by weakening the strong .
  削弱强者不能使弱者变得强壮。
• The arrangements of asia weaken .
  亚洲的格局淡了。
• He weakened after his illness .
  他病后身体虚弱。
• Tom's fright weakened every muscle in his body .
  汤姆所受的惊骇使他全身的肌肉都没有劲了。
• The dollar has weakened in international currency trading .
  美元在国际货币交易中已趋疲软。
• Many a strong man has weakened before such a challenge .
  很多坚强的人面对这种困难都动摇了。
• The currency of that country is weakening on foreign exchanges .
  那个国家的货币在外汇市场上疲软。
• The burlesque element weakens the serious portions of the book .
  书里的戏谑成分使严肃部分受到损害。
• One must never relax pressures when the opponent is weakening .
  在对手软下去时，我们决不能放松压力。