embryonic development短语⁴⁷⁹¹² 基本例句 胚胎发育 The idea of starting embryonic development without fertilization isn't new, she said, but these researchers have taken it a step further by generating stem cells. 她说，使一个未受精卵开始发育的想法并不是新的，但是这些研究者通过提取干细胞使这种想法向前迈了一步。 dxy