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.
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。
A clever trick is to number the chunks to allow users to perceive how much is left and also to perceive that they are moving forward. It provides clear direction of a way forward.
一个小技巧是给每组信息标上序号，这样用户可以知道还有多少步骤剩下，而且会有前进的方向，按照数字标识的顺序走即可。
A clever trick is to number the chunks to allow users to perceive how much is left and also to perceive that they are moving forward. It provides clear direction of a way forward.
一个小技巧是给每组信息标上序号，这样用户可以知道还有多少步骤剩下，而且会有前进的方向，按照数字标识的顺序走即可。
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