您要查找的是不是：
- Langhans rs layers 郎罕氏层
- Langhan rs layer 细胞滋养层
- placental Langhans rs layer 胎盘郎罕氏层
- The ONU only requires one MAC instance since frame filtering operations are done at the RS layer before reaching the MAC. 由于帧在到达MAC前由RS子层进行过滤，所以每个ONU只需要一个MAC实体。
- A skilled person can split slate into layers. 手巧的人能把板岩剖成片。
- There are several layers of meaning. 有几层不同的含意。
- The growth of successive layers of a cell wall. 敷着，附着细胞壁连续层的生长
- This layer of rock contains a lot of flint. 这一岩层中有大量燧石。
- Langhans rs giant cells 郎罕氏巨细胞, 胎盘巨细胞
- Composed of layers bonded together. 层积的由合在一起的薄层组成的
- Langhans rs cells 郎罕氏细胞
- The inner layer of the wall of a spore. 孢子内壁孢子壁的内层
- Langhans rs stria 郎罕氏纹
- There is a fine layer of dust on the desk. 桌子上有一层薄薄的尘土。
- They drilled through several layers of rock to reach the oil. 他们钻透了几层岩石以寻找石油。
- 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 expedition suffered all the rigo(u)rs of a Canadian winter. 这支探险队饱受了加拿大严冬的折磨。
- 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
