elevator pawl shifting pin

例句：

1. 1. The elevator was out of order, and we had to use the stairs instead.
   电梯出了故障，我们不得不走楼梯。
2. 2.The engineer carefully checked the elevator pawl shifting pin before starting the machine.
   工程师在启动机器之前仔细检查了电梯爪换档销钉。
3. 3. The new elevator has a more sophisticated system that requires less maintenance.
   新电梯的系统更为先进，维护需求减少。