checked regularly and well -maintained 定期检查和保养
checked regularly and well - maintained
定期检查，保养良好
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Railroad lines are regularly checked, in fact, and well maintained.
事实上，铁路线会受到定期检查，并且被很好地维护。
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