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。
On the contrary, if XML documents are received from an unknown source, be careful to validate XML documents to maintain data integrity.
信号的盲分离就是从一组由未知源信号混合得到的观测信号中估计源信号的过程。
Blind sources separation (BSS) is process of estimating unknown source signals from observed signals which are mixtures of unknown source signals.
有些静电计和皮安计具有内置的电压源，能够自动地计算出未知电阻。
Some electrometers and picoammeters have voltage sources built into the instrument and automatically can calculate the unknown resistance.
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