empty space是什么意思 empty space怎么读
empty space的英文翻译是什么意思，词典释义与在线翻译
empty space的用法和样例
- All tanks are powder and vacuum insulated in the annular space.
所有罐都有真空环形隔热层。 - Suppose that there is a gas in one compartment and that the other is empty.
我们假定一室内装有气体，另一室为真空。
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