苦口
- na.in earnest; bitter to the taste
 - 网络bitter taste in the mouth
 
苦口苦口
in earnest
 ... 空口[ eat dishes without rice or wine] 苦口[ earnestly;in earnest] 利口[ quick of speech;having a sharp tongue] ... 
                bitter taste in the mouth
COMPLETE BANK OF TERMS USED BY N ... 苦入心 bitterness enters the heart 苦口 bitter taste in the mouth 苦瓜 balsam pe…
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