work.horse
n.（名词）Something, such as a machine, that performs dependably under heavy or prolonged use:重负荷机器：某物，比如机器，在过强或延长的作用下运行得很可靠：例句：.the 50-year-old DC-3 . . . one of aviation`s most effective workhorses.(Christian Science Monitor).五十年的DC—3…航空的最有效率的机器之一.(基督教科学箴言报)
A horse that is used for labor rather than for racing or riding.役马：不用于比赛或乘骑而用于劳作的马Informal A person who works tirelessly, especially at difficult or time-consuming tasks.【非正式用语】 吃苦耐劳的人：不知疲倦地工作的人，尤指在困难的或消耗时间的工作上
