But he added that " the farthest we could get is day 14 in human embryo development."

但他补充说，“我们最多只能做到人类胚胎发育的第 14 天。”

She said the model her group worked with appears similar to embryo development up to 14 days from fertilization.

她说，她的团队研究的模型看起来类似于受精后14天的胚胎发育。

More positively, cell migration is the driving force of embryo development and is, in adults, essential to the immune response and to the healing of wounds.

更加肯定的是，细胞迁移是胚胎发育的原动力，而且对成年人来讲，细胞迁移对免疫反应以及伤口愈合非常重要。

This also might've happened through changes in the expression of genes, in this case in the genes involved with egg retention or embryo development.

这也可能是通过基因表达的变化发生的，在这种情况下是与卵子保留或胚胎发育有关的基因。

New research into African killifish has shown that its period of diapause during embryo development has no negative effects on the lifespan of a fully developed adult.

对非洲鳉鱼的新研究表明，它在胚胎发育过程中的滞育期对发育完全的成年鳉鱼的寿命没有负面影响。

For decades, studying this crucial, early time in a human embryo's development was a technical headache - embryos are hard to get and keep alive outside the body.

几十年来，研究人类胚胎发育的这一关键早期阶段一直是技术难题——胚胎很难在体外获得并保持活力。