His weak voice was almost inaudible.

他的声音微弱，几乎听不见。

柯林斯例句

She spoke in a weak voice.

她有气无力地说话.

《简明英汉词典》

There was something about that weak voice that sounded familiar.

由他这一句话使我听了这个弱小口音仿佛在哪里听过的.

汉英文学 - 中国现代小说

He heard my weak voice and worried me too much.

他听到我虚弱的声音而且非常的担心我.

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