净口
词典performance of folk art without using obscene language：净口。
1. 当众表演必须净口，这是舞台表演的基本要求。
It is a basic rule not to speak dirty words in public performances.
2. 经野外采样及鉴定，发现在云南东川汤丹铜矿分布着6科（丛藓科、真藓科、青藓科、羽藓科、牛毛藓科和绢藓科）16属（扭口藓属、净口藓属、对齿藓属等等）22种苔藓植物，其中59%是丛藓科植物，为优势科。
Of 6 families (Pottiaceae, Bryaceae, Brachytheciaceae, Thuidiaceae, Ditrichaceae and Entodontaceae) were found, 59% of which was Pottiaceae as a dominant family.