during後為什麼一定+the

不一定，可加也可以不加the，中文意思是prep. 在……期間在……期間的某個時候

During the drought the river dried up.旱災期間，河流都乾涸了。

He became a navigator during the war.

戰爭期間他成了一名領航員。

Reciprocating compressors are prone to wear and tear during operation.

往復式壓縮機在運行中容易磨損和斷裂。