be keen on后面加什么

They tend to be keen on volume of effort and overlook efficiency.

他们倾向于在乎努力的`量而忽略了效率。

French officials may be keen on Eurobonds, but dare not speak of them in public.

法国官方也许渴望欧洲债券，但是并不敢在公共场合表现出来。

In addition, a hero must be optimistic and diligent and be keen on his hard work.

此外，一个英雄必须乐观和勤奋和热衷于他的努力。