汽车安全带

例句：

1. 1. The driver must fasten hisseatbelt before starting the engine.
   驾驶员在启动引擎前必须系好安全带。
2. 2. The child was strapped in acar seat during the trip.
   孩子在旅途中被安全带固定在了儿童座椅上。
3. 3. The policeman instructed everyone tofasten their seatbelts as theyboarded the bus.
   警察指示每个人上车时都要系好安全带。