The words I don't have time should never escape your lips.
绝对不该说“我没有时间”这样的话。
The words' I don't have time 'should never escape your lips.
绝对不要说‘我没时间’这样的话。
This is because, with practice, your lips form a better seal around the holes, so that air does not escape.
这是因为通过练习，你的嘴唇会紧紧地密封住吹孔，这样气流就不会在嘴唇边漏掉了。
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