求翻译：37. On the ground, liquid hydrogen must be stored in large stainless steel tanks with double walls filled with____ and evacuated to a high vacuum.是什么意思？

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37. On the ground, liquid hydrogen must be stored in large stainless steel tanks with double walls filled with____ and evacuated to a high vacuum.

问题补充：

匿名	2013-05-23 12:21:38

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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