名词
中文翻译：中轴
同义词：
['mainshaft', 'shaft']
例句：
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1.The machine has a countershaft that runs through the center of the machine.
这台机器有一个穿过机器中心的中轴。
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2.The car's engine is located in the countershaft, which is attached to the transmission.
汽车的引擎位于中轴上，与变速器相连。
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3. The engineer carefully removed the countershaft from the machine to inspect it for wear.
工程师仔细地从机器中取出中轴，检查其磨损情况。