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。

Open the indicator, put on your lifejacket.

打开示功考克；船上救生衣。

The lifejacket whistle in Chief Mate's cabin missing.

大副房间的救生衣哨子丢失。

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。