ectoderm
n. 外胚层,外细胞层
例句
Ectoderm follows a default pathway.
外胚层遵循一个默认的路径。
The little tadpole, about the size of a sesame seed, is now made up of three layers: the ectoderm, mesoderm and endoderm.
芝麻籽大小的小蝌蚪现在已经分成了三层:外胚层、中胚层和内胚层。
The little tadpole about the size of a sesame seed is now made up of three layers: the ectoderm mesoderm and endoderm.