Was she wearing a seat belt?

她系着座椅安全带吗？

He unbuckled his seat belt.

他松开了他的安全带搭扣。

The car seat belt slotted into place easily.

那个汽车安全带很容易就扣好了。

The fact I was wearing a seat belt saved my life.

我系着安全带，幸免于难。

Children must use an approved child restraint or adult seat belt.

儿童必须使用经过认可的儿童安全带或成人座椅安全带。