1.Mouth, When you are thinking , you often purse your lips. You might also use this position to hold back angry words you don't wish to say.
嘴部，当你在思考问题时，通常会撅起嘴来。你也很可能这样做以控制不想说的怒言脱口而出。
2.Just purse your lips and whistle - that's the thing.
噘起嘴唇吹个口哨-就是这样。