音標(biāo)發(fā)音英式音標(biāo) [?ek.t?.d??m]美式音標(biāo) [?ek.t?.d??m]英式發(fā)音 美式發(fā)音 基本解釋n.外胚層同根派生 ectoderm相關(guān)詞英漢例句Any of the blastomeres from which the ectoderm develops. 外裂球任一種發(fā)育成外胚層的裂球An inward fold on the surface of the embryonic ectoderm that develops into part of the anal passage. 原肛肛道胚胎消化道表麪的凹陷，發(fā)育成直腸的一部分Derived from two embryonic germ layers, the ectoderm and the endoderm. Used of lower invertebrates, such as sponges and coelenterates. 雙胚層的具有兩個(gè)胚層（外胚層和內(nèi)胚層）的。用於低等無(wú)脊椎動(dòng)物，如寄生蟲和腔腸動(dòng)物The resulting gastrula consists of an outer ectoderm, an inner endoderm, and a mesoderm layer positioned between them. 最終原腸胚由一個(gè)外腸胚，內(nèi)腸胚，和一個(gè)中腸胚搆成。The primitie mouth, or stomodeum, is a slight depression on the surface of the ectoderm. 原始的口（或口凹）是外胚層表麪的一個(gè)輕微的凹陷。ectoderm更多例句英英字典劍橋英英字典 the cells in the embryo of a human or animal that develop into skin, hair, and the nervous systemectoderm劍橋字典ectoderm柯林斯字典