在世界范围内以一种可比较的方法来衡量儿童早期发育的状况，是各国社会评价成功状况的一种途径。
Measuring the state of early child development with a comparable approach throughout the world will provide a way for societies to judge their success.
“出生时四肢俱全的孩子就照人类特有的途径发育，”布隆·伯格写道。
"For a child born with all her limbs, development follows a path that is typical of our species", Blumberg writes.
为了模拟视网膜发育的早期阶段，研究人员需要构建出浓度梯度差异极其细微的溶液来培养细胞以使它们向不同的途径分化。
To mimic early stage retinal development, the researchers needed to build microscopic gradients for solutions in which to bathe the stem cells to initiate specific differentiation paths.
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