词语下苦功夫
解释at pains
at pains〔介词〕尽力,用心,下苦功夫详细»
at pains〔形容词〕尽力,用心,下苦功夫详细»
下苦功夫at pains;at the pains;go to great pains详细»
下苦功夫at pains;at the pains详细»