Indeed, many of these early elevators were supervised by lift operators and primarily powered by steam or hydraulics.

事实上，许多早期的电梯都是由电梯操作员监督，主要由蒸汽或液压驱动。

They're all the shippers and the truckers and the containers operators and the lift operators.

他们都是托运人、卡车司机、集装箱操作员和电梯操作员。