在未受精卵中，这些物质是不活跃的，而且分布不均匀。
In the unfertilized egg, the substances are inactive and are not distributed homogeneously.
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。
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。
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.
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