引用第7楼kaobohaha于2014-02-23 12:09发表的 :
再来一句:
On average, she says, 25% of the cells survive(幸存)the stress and 30% of those convert to pluripotent cells — already a higherproportion(比例) than the roughly 1% conversion rate ofiPS cells, which take several weeks to become pluripotent.
请战友来解释一下绿色部分的语法结构。