workhorse /ˈwɜːkˌhɔːs/

• 1. 

  N-COUNT A workhorse is a horse which is used to do a job, for example, to pull a plow. 役马; 耕马

• 2. 

  N-COUNT If you describe a person or a machine as a workhorse, you mean that they can be relied upon to do a large amount of work, especially work that is dull or routine. 吃苦耐劳的人 [usu with supp]

  例：

  For years the Apple II had been the workhorse in schools across America.

  过去很多年里苹果II一直是全美学校的主要电脑。

  例：

  My husband never paid any attention to me. I was just a workhorse bringing up three children.

  我丈夫从来不关怀我，我只是一个养育了三个孩子的老妈子而已。