你必须穿救生衣。

You must wear a life jacket.

我们在划独木舟时总是穿救生衣。

We always wear life jackets when canoeing.

在船上，每个人都必须穿救生衣。

On the boat, everyone must wear a life jacket.

每个划桨者都必须穿救生衣以确保安全。

Every paddler must wear a life jacket for safety.

不懂游泳的孩子应该穿救生衣。

Kids who don't know how to swim should wear life jackets.

潜水时我们要穿救生衣.

We should wear a life jacket when we go diving.

舷外或高空作业要穿救生衣。

Life jacket must be worn when working outboard or overhead.

不过，在船.上要穿救生衣。

But when you're in a boat, wear a life jacket.

协助搜寻穿救生衣的落海者；

Aid in life jacket detection for sea rescues;