He shouldn't be doing heavy manual work at his age.

在他这个岁数，不应该再干重体力活了。

youdao

Material transport is a heavy and complicated work, the traditional mode of transportation required manual, it's a waste of human resources and high-risk factor.

物料运输是一项繁重复杂的工作，传统的物料运输方式需要人工操作，不仅浪费人力资源而且危险系数高。

youdao