求翻译：Because they are sealed between two panes of glass in a hermetically sealed unit, they never get dusty or dirty and need cleaning.是什么意思？

待解决

悬赏分：1 - 离问题结束还有

Because they are sealed between two panes of glass in a hermetically sealed unit, they never get dusty or dirty and need cleaning.

问题补充：

匿名	2013-05-23 12:21:38 因为它们密封玻璃密封装置的两个窗格之间，他们永远不会得到灰尘或脏，需要清洗。

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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