feeble

A weak and unconvincing reason given to justify a fault.

无力的尝试

A poorly executed or unsuccessful try to do something.

指执行不力或不成功的尝试。

微弱的努力

An action requiring exertion that is weak or ineffective.

指需要付出但却软弱或无效的行动。

微弱的光线

A dim or weak source of illumination.

指昏暗或微弱的光源。

理解力弱

A weak physical hold or a poor understanding of a subject.

指理解水平差。

无力的笑容

A weak, slight, or forced smile.

指虚弱、轻微或勉强的微笑。

意志薄弱的头脑

Lacking intellectual power; suggesting foolishness or low intelligence.

缺乏智力；暗示愚蠢或智力低下。