- by trial and error通过尝试和错误
- be hard up for money手头拮据;床头金尽;手头困乏;
- be hard up for缺少某事物，需要某事物;
- be hard on sb.v.过分严厉对待某人;
- drive a hard bargain极力讨价还价;
- die hardv.难改掉;难消减;顽固到底;根深蒂固;
- error block错误字组，错误块;
- fundamental attribution error基本归因误差;
- human error人为误差;
- hard work繁重的工作;劳苦;苦工;苦功;
- hard timesn.低潮;艰难时世;
- hard time艰难时刻;
- hard sell强行推销;硬性销售;
- hard of hearing听觉不灵的;聋;重听;耳背;
- hard linen.强硬路线;
- hard labourn.强迫劳役;苦役;苦工;
- hard goodsn.耐用的商品;硬货;
- hard drug<口>（会在生理和心理上）致瘾的麻醉品;毒品;
- hard disk partitionn.硬盘分区;
- hard diskn.硬盘;
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