来源于
6.The IDG gene from Ralstonia eutropha encoding the Indole dioxygenase was constructed with PTL12 from specific promoter in cotton fiber to form eukaryote vector which contents the prokaryote promoter of Indole dioxygenase.
8.An insecticide derived from a plant, e.g. pyrethrum (from Chrysanthemum flowers).
1.It derives from the roles in Peking opera.This kind of role represents hordes of troops and horses and is usually formed by a group of people.They perform to emphasize the atmosphere by following the leading actor.
这个词来源于戏剧里的角色，一般由一群人组成，代表千军万马。他们总是跟着主角跑，也就是起着衬托气氛的作用。
