beast of burden

noun
🔊/ˌbiːst əv ˈbɜːdn/
🔊/ˌbiːst əv ˈbɜːrdn/
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  1. an animal used for heavy work such as carrying or pulling things役畜;牲口;驮兽
    • The donkey is used as a beast of burden.驴被用作负担的野兽。