All high points of each section treated shall be properly vented for air escape.
每部份处理管道的所有高点都应适当通风以便空气排出。
Don not let air escape around your lips and control the air flow well. Try many times, and your will succeed.
注意嘴型不要漏气了,好好控制一下气流,多多尝试。
The liquid can't escape into the air, because it's inside a pipe.
液体不会漏到空气中,因为它在管子里。
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