| 例句 |
The lace snapped when I pulled hard at it.我用力拉鞋带，鞋带啪地绷断了。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。It is a demanding role and she needs to work hard at it.那是一个要求很高的角色，她为此必须狠下苦功。I've been hard at it all the morning.我一上午都在卖力地干。Sarah was hard at it on her computer.萨拉在计算机上忙着。They had been hard at it since we arrived.我们到了之后他们一直在努力工作。 |