elevator(-ladder) dredge

例句：

1. 1. The elevator was out of order, so we had to take the stairs.
   电梯出了故障，所以我们不得不走楼梯。
2. 2. The elevator is a popular mode of transportation in many cities.
   电梯是许多城市中流行的交通工具。
3. 3. The elevator operator was very helpful and patient with us.
   电梯操作员对我们非常有帮助和耐心。