技术员正在维修空调。

The technician is servicing the air conditioner.

他们正在维修市电线路。

They are repairing the electric supply lines.

他们正在维修那架航空器。

They are repairing that aircraft.

他们正在维修船上的辅机。

They are repairing the auxiliary engine on the ship.

他们正在维修那座老房子。

They are repairing the old house.

河上的那座旧桥梁正在维修。

The old bridge over the river is being repaired.

他们正在维修那台机械设备。

They are repairing that piece of mechanical equipment.

他们正在维修那台旧的炮机。

They are repairing the old gun machine.

客梯正在维修，请使用楼梯。

The passenger elevator is under maintenance, please use the stairs.

他们正在维修公园里的游乐设施。

They are repairing the recreation facilities in the park.