维修费主要贵在人工，而不是零件。

The cost of the repair is high mainly due to the ___labor, not the parts.

这个建筑项目需要大量的熟练劳动力。

The construction project requires a significant amount of skilled ___labor.

自动化减少了许多工厂对体力劳动的需求。

Automation has reduced the need for manual ___labor in many factories.