| 单词 | be hard at it |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔WORK HARD〕Mike's been hard at it all afternoon and he still hasn't finished mending the car. 迈克卖力地干了一个下午，还是没有修好汽车。朗文写作活用〔hard〕I've been hard at it all the morning.我一上午都在卖力地干。英汉大词典〔hard〕They had been hard at it since we arrived.我们到了之后他们一直在努力工作。外研社新世纪 |
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