translation.en: Unlike DNA, which is mainly fixed, microRNAs can vary depending on internal and environmental conditions at any given time, telling us which genes are actively expressed at that particular moment.
translation.zh: 和基本固定的DNA不一样 微型RNA根据不同时间的内部和外部环境因素 可能各不相同 它告诉我们在一个特定时间，哪些基因是主动表达的