If you compare her work with his, you'll find hers is much better.
要是把他们俩的工作比较一下,你就会发现她的好得多。
is as the proportion of the total vocabulary of his mother tongue against those words of his own baby talk that are taken up into the vernacular of his family.
就好像他本国语言的总词汇量和自己咿呀学语时他家庭所接纳的他的词汇量之比。