也还行欸

yo yo

Cough with your mouth covered (by hands), please.

Cover your mouth plz by your hands when you will cough.字数略多，但不会出错。

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Please cough with your mouth covered.

Cover your mouth when coughing nd sneezing. But remember keep your hands clean. Normally with a tissue by hands. If you don't have a tissue, cough or sneeze into your elbow, not your hands