level通常用複數嗎

通常用複數，複數是levels，例如：

1、Wage rates depend on levels of productivity.工資水平取決於生產量的多寡。

2、They were required to cut pollution levels， on pain of a £ 10 000 fine if they disobeyed.他們被要求降低污染水平，違則罰款1萬英鎊。

3、It is important not to let production levels fall.重要的是別讓產量滑落。