讨论了多相物质粉末衍射的物相检索问题，介绍了XRDS的物相检索软件。
The problems of phase identifying for powder diffraction of multiphase material have been discussed, and the software XRDS for phase identifying have been introduced.
同质物质是由许多相同的产物或分子组成的物质。
A homomeric substance is one which is made out of any number of identical products or molecules.
有一个巧妙的方法来纯化dna，用一种酶能够辨别和摧毁微生物有机体的遗传物质而不会销毁太多相关的DNA。
Purifying it involved a clever trick using enzymes that can identify and destroy the genetic material of micro-organisms without also destroying too much of the DNA of interest.
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