The invention can prevent the impurity penetrating into the interior of the control panel through the space between the button and the button hole.
本发明可以防止异物质通过按钮与按钮孔之间的缝隙渗透到控制面板内侧。
Tom was tugging at a button-hole and looking sheepish.
汤姆拽着一个钮扣孔，一副害羞的样子。
Tom was tugging at a button-hole and looking sheepish.
汤姆拽着一个钮扣孔，一副害羞的样子。
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