The first stage involves growing a layer of real skin around a sample of the bulletproof skin, which takes about five weeks.

第一阶段的实验需要在防弹皮肤的样本周围培养出一层真正的皮肤，这需要大概五周的时间。

youdao

Every work has to be preceded by the stage of planning, and the work that involves writing - first of all.

任何工作的开展都需经历计划的过程，涉及到写作时更是如此。

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So, as a last resort they had consented to surgery, the first stage of which involves implanting electrodes into the brain in order to locate the exact source of the seizures.

所以，孤注一掷，也只好同意进行手术了，为了找到癫痫的真正源头，第一步要移植电极到大脑里面去。

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The first stage in an audit involves asking whether the organisation deserves to be considered at all: is it a real not-for-profit agency, committed to the relief of suffering?

ECONOMIST: Humanitarian aid: Weighed and found wanting | The

The first stage of the application process involves groups setting out their aims and "vision" for the school and the area they hope to serve as well as showing demand from parents.

BBC: Teachers are half of free school inquiries