Flushing L. O. system of stern tube.

艉轴管滑油系统的投油清洗。

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Therefore it is an urgent matter to find new material for stern tube bearings.

因此，寻找新的尾轴承材料，已是当务之急。

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Therefore it is an urgent matter to find new material for stern tube bearings.

因此，寻找新的尾轴承材料，已是当务之急。

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