名词
中文翻译：内胚层同义词
同义词：
['innermost layer', 'innermost part']
例句：
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1. The embryonic stage is the most vulnerable period for the development of a plant.
胚胎阶段是植物发展最脆弱的时期。
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2. The innermost layer of the skin is where the nerves are located.
皮肤的最内层是神经所在的位置。
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3. During the early stages of development, the innermost layer of the embryo is still developing.
在发育的早期阶段，胚胎的最内层仍在发育中。