名词
中文翻译：外胚轴
同义词：
['outer primordium', 'outer root cap']
例句：
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1.The epicranial stem is the part of the eyeball that is visible through the skin.
外胚轴是眼球球体可见的部分。
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2.During embryonic development, the epicranial stem undergoes significant changes in shape and size.
在胚胎发育过程中，外胚轴的形状和大小会发生显著变化。
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3. His research focused on the role of the epicranial stem in neural development.
他的研究专注于外胚轴在神经发育中的作用。