名词短语
中文翻译：清理轨道
同义词：
['track clearing', 'track maintenance']
例句：
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1. The engineers were clearing thetracks for the new train.
工程师们正在为新火车清理轨道。
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2. Thepolice cleared the tracks toallow the construction work to proceed.
警方清理了轨道，以便继续施工。
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3. The farmershad to clear the tracks beforethey could plant their crops.
农民们在种植作物之前必须清理好轨道。