Children’s main job is to figure out how their complex world works. In order to master the things they need to at each developmental level they will test their parents.

孩子会主动学习这个复杂世界的法则，在不同的发育阶段，他们都会为作出各种尝试，以了解这些法则。

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Since most of the flying at this stage of the F-22 program concerns developmental tests why does the F-22 CTF need an operational test pilot?

既然F-22项目现阶段最为关注的内容是研发试飞，为什么F-22综合测试大队会需要战斗试飞员呢？

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However, whether the embryos have full developmental potential need to carry out follow-up experiment, such as embryo transfer can be confirmed.

但该胚胎是否具有完全的发育潜能，尚需进行胚胎移植等后续实验才能证实。

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The X-Man notes that half of all Americans who enter college never finish, that almost sixty per cent of students who enroll in two-year colleges need developmental (that is, remedial) courses, and that less than thirty per cent of faculty in American colleges are tenure-track.

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Although some developmental kinks still need to be worked out, the inclusion of such technology in the Japanese bid is surely the latest phase of a traditional decision-making process that involves several cycles (and often years) of understanding, review, and comment by managers at various levels.

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They need help at the early stages from subsidized sources of finance that care about the developmental and environmental benefits of their work.

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