名词
中文翻译：单轴
同义词：
['sole axle', 'single shaft']
例句：
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1.The car has a single axle, which makes it easy to maneuver.
这辆车只有一个轴，这使得它易于操控。
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2.The train has a single axle, which is why it can only travel at one speed.
火车只有一个轴，这就是为什么它只能以一个速度行驶。
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3.The bicycle has a single axle, which makes it easy to balance.
自行车只有一个轴，这使得它很容易保持平衡。