是spare no effort to do还是spare no efforts to do?

问题描述:

是spare no effort to do还是spare no efforts to do?

不遗余力做某事的翻译应该是
spare no effort to do
其实efforts也没错,effort可以是可数也可以是不可数,不信可以查一查,而且也有用spare no efforts to do的,不过一般用effort吧.