[ké tuò chéng zhū]   

咳    唾    成    珠    咳唾：咳嗽吐唾沫，比喻谈吐、议论。“咳”也写作“欬”。比喻言辞精当，议论高明。也形容文词极其优美。

咳唾：咳嗽吐唾沫，比喻谈吐、议论。“咳”也写作“欬”。比喻言辞精当，议论高明。也形容文词极其优美。

Cough and spit and both the phlegm and saliva become pearl -- words uttered by a talent become famous sentences

咳唾成珠    咳声叹气    咳珠唾玉