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。
Similarly, water pumps, power steering pump, air conditioning compressor bearings should be regularly checked.
同理，水泵、转向助力泵、空调压缩机的轴承也应定时查看。
Similarly, water pumps, power steering pump, air conditioning compressor bearings should be regularly checked.
同理，水泵、转向助力泵、空调压缩机的轴承也应定时查看。
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