effort可數還是不可數名詞

　　His efforts were amply rewarded.

　　他的努力得到了豐厚的回報。

　　All my efforts ended in failure.

　　我的一切努力最后都無濟于事。

　　Their efforts to revive him were futile.

　　他們努力使他蘇醒，但失敗了。

　　Efforts to preserve the peace have failed.

　　維護和平的努力失敗了。

　　His efforts to get a job proved unsuccessful.

　　他求職的努力都落空了。