Use of physical or mental energy; hard work.
运用体力和智力的艰苦劳动。
The energy compensation principle of hard coal crack and Its Applications
硬煤裂隙能量补偿原理与应用
Bond Gibbs energy and quantitative classification of acids as hard or soft in aqueous solution
键自由能与水溶液中硬软酸的定量分类
The first batch of solar energy kitchen has come out after the attentive and hard work of several months.
在几个月的专心竭力的工作后第一批太阳能灶问世了。
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