His voice was unsteady and only just audible.

他的声音颤抖，只能勉强听清。

《柯林斯英汉双解大词典》

The singer's voice was just audible.

那名歌手的声音刚刚能听见。

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The splashing of the Fontana della Baraccia remains just about audible above the din of hundreds of tourists that are sprawled over the Spanish Steps.

成百位遍布西班牙阶梯上的游客制造的喧闹声中，依然可以听到破船喷泉（the Fontana della Baraccia）的喷洒。

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Audible content, though, is more than just books.

CNN: Books on tape, on the Web

Just be sure not to invite me - I'm not one for the audible sound of a heart breaking.

FORBES: Magazine Article