This is a life preserver.

这是救生用品。

The life preserver kept him up until the boat came.

救生衣使他保持浮在水面直到小船来救他。

Alright, I'll go and take my life preserver. Promise me nothing bad will happen.

那好吧，我去拿救生圈。你要保证我没事。

Floating seat cushion: if someone fell overboard, could function as a life preserver.

飘浮的座位靠垫：如果有人从船上翻落水中时，可作救生用。

While these ads yielded small amounts of money compared to banner ads at the time, as the dot-com bubble burst, this system became our life preserver.

尽管这种广告比横幅广告赚的钱少，但在网络泡沫破灭的时候，这套系统成了我们的生命线。