名词
中文翻译：工作马
同义词：
['laboratory animal', 'hardworking animal']
例句：
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1.This workhorse is the best at pulling heavy loads.
这头工作马是拉重物最好的。
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2. The farm has a lot of workhorses, but they're all well-trained.
农场有很多工作马，但它们都训练有素。
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3. The farmer relies on his workhorses to do the heavy lifting.
农民依赖他的工作马来完成繁重的劳动。