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。
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。
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