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。
- unidirectional layer 单向层
- 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
- The reinforcement was unidirectional. 增强是单方向的。
- A surface, layer, or mass of frozen water. 冰面冻结的水的面、层或块
- Channels can be unidirectional or bidirectional. 通道可以是单向的或双向的。
- A thin layer of bone, membrane, or other tissue. 骨骼、粘膜或其它组织的薄层
- An electrical system fed by unidirectional voltage. 由直流电压供电的系统。
- First this is an unidirectional adjustment. 首先这是一次单向调节。
- 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
- Conversion of alternating to unidirectional current. 整流交流电转变到单向电流
- 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
- Events in the world undeniably form a unidirectional sequence. 无可否认的，世界上发生的事件只有单向的顺序。
- XLink offers much more than unidirectional linking, though. 但XLink提供的远远不止是单向链接。
- 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
