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Be sure that you do not remove metal when cleaning ring grooves or oil slots.
清洁活塞环槽或油环开缝，绝对不能损伤金属部分。
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An often overlooked function of oil is ring and valve sealing.
一个经常被忽视的功能是环和油阀密封。
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An often overlooked function of oil is ring and valve sealing.
一个经常被忽视的功能是环和油阀密封。
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