- n.
1.外胚层。
2.外层。
短语和例子
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ectoderm中文什么意思
例句与用法
- Ranging from 100 to 200 microns across , the width of several human hairs , these microscopic fossils are surprisingly complex and constitute almost a textbook example of a bilaterian , including the three major tissue layers ( the endoderm , mesoderm and ectoderm familiar from high school biology texts ) , the presence of a gut with a mouth and anus , and paired coeloms ( body cavities ) surrounding the gut
这些微化石的大小为100 ~ 200微米，相当于几根头发的宽度， ?们看起来出奇复杂，而且简直就像两侧对称动物的教科书般，展示了各种特徵：包括三个主要的组织层（内胚层、中胚层及外胚层，都是中学生物课本中熟悉的名词） ，前后连接口部与肛门的肠腔，肠腔外还围绕著成对的体腔。
英文释义
名词百科释义
Ectoderm is one of the three primary germ cell layers in the very early embryo. The other two layers are the mesoderm (middle layer) and endoderm (most proximal layer), with the ectoderm as the most exterior (or distal) layer.
详细百科解释