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1·He would need all his authority to keep the weak-kneed volunteers from bolting.

他需要动用所有的职权以防止这些胆小的志愿兵逃跑。《柯林斯英汉双解大词典》

2·He's just a weak-kneed coward.

他只是一个别容易屈服的懦夫。

3·The role of the dissenter is not for the weak - kneed.

反对者的角色不是软弱之人所能够担当的。