Preoperation
空转, 试运行, 试运转
🗣️ 情景例句
I know what you mean.
我懂得你的意思。
I'll be right with you.
我马上就来。
This is done by a great number of ring-shaped air jets on the bottom of the craft.
船底装上大量环状喷气嘴以实现这一目的。