Meanwhile, the rotation made gears pump out water, crush grain, or power mills, which is where the name " treadmill" originated.
同时, 旋转使齿轮泵出水,压碎谷物,或为磨坊提供动力,这就是“ 跑步机” 名称的由来。
单词 | gear pump |
例句 |
原声例句
TED-Ed(视频版) Meanwhile, the rotation made gears pump out water, crush grain, or power mills, which is where the name " treadmill" originated. 同时, 旋转使齿轮泵出水,压碎谷物,或为磨坊提供动力,这就是“ 跑步机” 名称的由来。 |
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