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
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。