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用以保持止动环的槽。
Snap ring used to maintain the groove.
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清洁活塞环槽或油环开缝，绝对不能损伤金属部分。
Be sure that you do not remove metal when cleaning ring grooves or oil slots.
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大多数活塞的顶部有3个活塞环槽。
Most pistons have three ring grooves at the top.
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大多数活塞的顶部有3个活塞环槽。
Most pistons have three ring grooves at the top.
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