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Why did the recess bell ring 20 minutes early?
为什么下课铃提前20分钟就响了？
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An elastomer or adhesive ring filling the recess is arranged between the closing element and the recess for the positioning of the cap.
当装上帽盖时，一个弹性体环或粘合剂环设置在封闭元件与凹陷之间，该弹性体环或粘合剂环填满所述凹陷。
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