be keen on後面加什麼

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

他們傾向於在乎努力的`量而忽略了效率。

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

法國官方也許渴望歐洲債券，但是並不敢在公共場合表現出來。

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

此外，一個英雄必須樂觀和勤奮和熱衷於他的努力。