strap up

例句：

1. 1. The car's seat belt is not working properly.
   这辆车的座椅安全带不工作了。
2. 2.We need to strap up the luggage before we leave.
   在我们离开之前，我们需要系紧行李。
3. 3. The driver strapped up the child in his seatbelt before taking off.
   司机在起飞前把孩子系在了座位安全带上。