mom and aunt desperately pressed, or pressed not live them, so that They slipped.
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so that they slipped
所以他们滑倒了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The rings have joints (they are split) so that they can be expanded and slipped over the piston head and into the recessed grooves cut in the piston.
活塞环有接口（也就是有一缝隙），这样可以使端部扩张并滑入活塞上的凹槽中。
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