Supervisor Road: including oil suction line, pressure oil pipeline and oil return line, used to achieve the transfer of pressure energy.

主管路：包括吸油管路，压油管路和回油管路，用来实现压力能的传递。

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Drain line: the hydraulic components leaked oil into the return pipe or tank.

泄油管路：将液压元件泄露的油液导入回油管或油箱。

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On Tuesday, the U.S. Coast Guard said the fire started with a leak in a fuel-oil return line running from one of the ship's engines.

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Hatfield said the oil return line is one of the items that is routinely inspected, but she did not say when it was last inspected or describe its condition at that time.

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