On the contrary, if XML documents are received from an unknown source, be careful to validate XML documents to maintain data integrity.
相反，如果从未知源获取XML文档，则要验证XML文档以维护数据的完整性。
You have received an update from an unknown source.
您已收到一个未知来源的更新。
Cosmic rays are being produced close to Earth from an unknown source.
宇宙射线由一个未知来源在地球附近产生。
Always scan a floppy diskette from an unknown source for viruses before using it.
在使用未知来源的软盘前，先进行病毒扫描。
Always scan a floppy diskette from an unknown source for viruses before using it.
在使用未知来源的软盘前，先进行病毒扫描。
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