One technical difficulty is cavitation, where low pressure behind a turning blade causes air bubbles.
一个技术难题是气穴现象，一旦发生气穴现象，位于旋转螺旋桨叶后方的低压会产生气泡。
Do you open a window instead of turning on air conditioning?
你会不会开窗户而不会开空调？
Does anyone mind me turning on the air conditioning? It is hot in here.
有人介意我开冷气吗？这里头好热啊。
Does anyone mind me turning on the air conditioning? It is hot in here.
有人介意我开冷气吗？这里头好热啊。
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