His breathing became faint.
他的呼吸变得微弱了。
《牛津词典》
You will have a hard time breathing, and you will feel faint.
然后你就会呼吸困难，觉得自己快要晕倒。
youdao
There was no sound at all save that of breathing, the faint, steady suspiration of complete and intent listening .
那儿除呼吸声和那全神贯注、专心静听的人们的轻微而又均匀的叹息外，一片寂静。
He nodded, though Lucy could still hear a more-than-faint wheeze in his breathing.
NPR: In 'Challenger Park,' Mom Is an Astronaut
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