The professor invented a filter that allowed him to successfully extract particles from the centre of the flame, where temperatures top 1, 400c, and then examined them.
周武宗发明了一个过滤器，它能从高达1400度得火心提取细小微粒，然后进行研究。
2
This paper describes using large scale integrated circuit—switch capacitatice filter (SCF) as basic components, taking out the characteristic of speech and making up microcomputer into control centre.