您要查找的是不是：
- This layer of rock contains a lot of flint. 这一岩层中有大量燧石。
- The inner layer of the wall of a spore. 孢子内壁孢子壁的内层
- There is a fine layer of dust on the desk. 桌子上有一层薄薄的尘土。
- embryonal layer 胚层
- The middle, usually fleshy layer of a fruit wall. 中果皮果皮中间通常含肉较多的那一层
- The bottom layer is a mixture of sand and clay. 最下面的一层是沙和泥的混合物。
- A fine layer of dust covers everything. 所有的东西都盖了一层薄薄的灰尘。
- A layer, as of doubled-over cloth or of paperboard. 一层一层，如折叠过的布料或纸板的
- At fourteen days an embryo's cells begin to split and form three embryonic layers, nervous tissue at this time has yet to appear, so it's impossible as researcher Pei has said for there to be any nervous system response. 一、4天的胚胎的细胞刚刚开始分化形成三个胚层，神经组织此时还没有出现，是不可能像裴研究员所说有什么神经系统的反应的。
- A surface, layer, or mass of frozen water. 冰面冻结的水的面、层或块
- This is embryonal carcinoma mixed with teratoma. 这是混有畸胎瘤的胚胎癌。
- A thin layer of bone, membrane, or other tissue. 骨骼、粘膜或其它组织的薄层
- Here is an embryonal carcinoma of the testis. 睾丸胚胎癌，上方是正常的睾丸的边缘。
- A thin, flat layer or scale, as that of a fish. 外表组织薄而平的一层或鳞状物，如鱼鳞
- Having a cortex or a similar specialized outer layer. 有皮的有皮的或具有相似的专门发育的外部覆盖的
- Embryonal carcinoma is more aggressive than seminoma. 胚胎癌比精原细胞瘤侵袭性更强。
- A coat or layer enveloping an organ or a part. 被膜一种覆盖器官或身体部位的覆盖层或包被
- A layer of skin peeled off her sun-burnt back. 她晒黑的背上掉了一层皮。
- The pollution had destroyed ozone layer and caused many changes in weather. 污染破坏了臭氧层，并引起了许多天气变化。
- The layer spindle was an early development. 层式纺锤形是早期发展起来的。
