单词：operon
operon的用法和样例：
例句
- In negative repressible operons, transcription of the genes on the operon normally takes place.操纵子亦可以是正向调控的。
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高频英语口语对话
一个英语单词可分为三部分：前缀（prefix）词根（root）后缀（suffix）。位于词根前面的部分就是前缀。前缀，可以改变单词的意思。 ation (用于名词)动作（造成的状态或结果） accommodation n.招
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