想请教XDF蓝皮阅读增补篇第23篇一句话的翻译

beijin111

第二段第一句：
Biologists once assumed that the variable rates at which cells synthesize different mRNA's determine the quantities of mRNA's and their corresponding proteins in a cell.
感觉怎么读都读不通，好像不完整啊。。

edwardelric

Biologists once assumed that the variable rates at    which cells synthesize different mRNA's    determine the quantities of mRNA's and their corresponding proteins in a cell.、
句式很工整啊
生物学家曾经提出在分泌不同的mrna时的多样的比率决定了mrna的数量和在细胞中的对应的蛋白质

beijin111

哦~明白了，谢谢~