| 单词 | 层组 |
| 释义 | 〔shale〕A fissile rock composed of layers of claylike, fine-grained sediments.页岩：一种由似泥土细粒的沉淀物层组成的易分裂的岩石〔blastula〕An early embryonic form produced by cleavage of a fertilized ovum and consisting of a spherical layer of cells surrounding a fluid-filled cavity. Also called blastosphere 囊胚：由分裂受精卵产生的早期胚胎外形，由围绕充满液体的洞的球形细胞层组成 也作 blastosphere |
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