名词
中文翻译：地面齿轮
同义词：
['ground drive', 'ground drive gear']
例句：
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1.The car's engine is running smoothly on the ground gear.
汽车在地面齿轮上运行平稳。
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2. The train has to switch to ground gear when it reaches a station.
火车到达一个车站时，必须切换到地面齿轮。
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3. The helicopter was able to land on the ground gear without any problems.
直升机能够顺利地在地面齿轮上着陆。