workhorse

详细解释:n. 载重马, 做重活的人

英语解释：

名词 workhorse:

machine that performs dependably under heavy usea horse used for plowing and hauling and other heavy labor

详细解释：

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.( * )

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