slight cough
他的病是从轻微咳嗽开始的。
His illness started with a slight cough.
youdao
通常最初还有轻微咳嗽，但多达50%的病人可有粘痰。
There is also usually an initial mild cough, but as many as 50% of patients can present phlegm.
他的病开始只是有点轻微地咳嗽。
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