rear chainman

例句：

1. 1. The rear chainman was responsible for the safety of the passengers.
   后座驾驶员负责乘客的安全。
2. 2. The rear seat passenger was not allowed to use the air conditioning.
   后座乘客不允许使用空调。
3. 3. The rear chainman had to make sure that all passengers were buckled in properly.
   后座驾驶员必须确保所有乘客都系好安全带。