英语语法分析

On a boat you must wear a lifejacket.

在坐船的时候，你必须穿上救生衣。

Don's lifejacket had failed to inflate.

唐的救生衣未能充气膨胀。

Do not inflate your lifejacket until you are outside of the aircraft.

在出机前请不要把救生衣充气。