effort既可做可数名词也是不可数名词，做可数名词,表示“费神的事,困难的事,成果”的意思；作不可数名词,表示“努力”的意思。
All our efforts were in vain.
我们的所有努力都付诸东流了。
His efforts were unsuccessful.
他的努力没有成功。
His efforts were to no avail.
他的努力是徒劳的。
They laughed at my puny efforts.
他们嘲笑我微不足道的努力。
I felt proud of his efforts.
我为他的努力感到自豪。
