They also separated out the DNA from the bacteria and analyzed its composition using a technique called high-resolution secondary ion mass spectrometry; the isolated DNA contained arsenic.
然后他们从细菌中提取出dna，利用高解析二次离子质谱技术分析了其中的化学组成，发现DNA中也含有砷。
We can adjust the final pyrolysis product composition by the control of secondary reactions conditions for different processes.
通过控制二次反应的条件，我们就可以控制热解产品的最终组成。
In secondary school composition teaching, the problem that students' creativity is strangled has been existing over a long period of time and is growing in intensity.
长期以来，中学作文教学中存在着扼杀学生创造力的问题，且有愈演愈烈之势。
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