Up to now, human embryonic stem cells have been derived at a later stage of development when the embryo consists of about 150 cells.

到目前为止，人类胚胎干细胞都来自于发育比较晚的的阶段，那个时候胚胎大约有150个细胞。

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And time is short: if Apple follows its typical development schedule, Jobs will stride onto a stage with a second-generation tablet no later than the spring of 2011.

而且时间紧迫：如果苹果遵循其典型的研发安排，最迟到2011年春天乔布斯就会迈入第二代平板电脑的阶段。

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Most of the problems are due to its early stage of development and will likely be fixed later.

大多数问题源于其早期开发，但将来很可能会得到解决。

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Other countries have also rung up hefty bills since the 2008 financial crash, but are at a much later stage of development than China, which faces a middle-income trap as its cheap labour pool dries up.

FORBES: Temper China Growth Expectations, Says CLSA Cheerleader

In the years immediately following the initial successes of IVF, the U.S. government established a requirement that any proposed research on human fertilization, embryos, or the later fetal stage of development must be reviewed by an ethics advisory board before federal funds could be used to support it.

FORBES: IVF And The Legacy Of Its Inventors

This more collaborative model is being applied to the high-risk innovative early stages of drug discovery, with companies taking on the highly expensive later stage development.

BBC: Falling drug breakthroughs 'a myth'