初级卵膜 meaning in English

primary egg envelope

The egg envelopes are composed of secondary envelope and primary envelope which comprise zona radiatal , zona radiata2 and zona radiata3 , and there are tube radiata and flexural sub - elasticity envelope which is vertical with plasma membrane in every zona radiata
唇(鱼骨)卵膜由初级卵膜和次级卵膜组成，初级卵膜具三层辐射带，带内具弯曲的弹性亚膜和辐射管，次级卵膜胶质状，外具浓密的颗粒。