come to doing一般常用的句型是‘When it comes to 动词+ing.’意思是‘当说到.的话题时.’ 例句 Harry never misses a trick when it comes to doing business....
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. ...
