名词
中文翻译：上轴
同义词：
['upper member', 'upper part']
例句：
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1.The upper shaft of the machine is where the gears are located.
机器的上部轴是齿轮所在的位置。
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2. The upper shaft of the building is where the elevators are located.
大楼的上部轴是电梯所在的位置。
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3.The upper shaft of the tunnel is where the air is pumped in.
隧道的上部轴是空气被泵入的地方。