To understand RNAi and RNA in general, researchers began isolating and studying RNA molecules just 21 to 30 bases long.
为了在总体上了解RNA干扰和RNA，研究人员开始分离并研究只有21到30个碱基长的RNA。
Objective to study how to accomplish the mission teaching pathological trainees in the base level general hospitals as the teaching bases.
目的研究作为教学基地的综合医院如何做好培养病理进修医生的教学工作。
Up to the present, no general formula, covering all kinds of multiple equilibrium systems of mixed acids and bases has appeared in chemical literature.
目前在化学文献中还没有一个能够包括各种混合酸碱的复杂体系的通用计算公式。
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