您要查找的是不是：
- A dyke was built to retain the floods. 修了一道堤坝挡住洪水。
- 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。
- The mental faculty of retaining and recalling past experience. 记忆，记忆力储存与回忆以往经历的大脑之能力
- 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。
- I retain a clear memory of those days. 我还清晰地记得那些日子。
- 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
- A surface, layer, or mass of frozen water. 冰面冻结的水的面、层或块
- He has managed to retain most of his fortune. 他设法保存了他的大部分财产。
- A thin layer of bone, membrane, or other tissue. 骨骼、粘膜或其它组织的薄层
- Concentrated study will help you to retain knowledge. 专心学习有助于你记住知识。
- Dicotyledonous plants retain a series of strands. 双子叶植物中保留着一系列的束。
- 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
- Refit the handwheel retaining screw. 重新装置手轮固定螺丝。
- Reinstall handwheel and secure with retaining bolt. 重新安装手轮，用固定螺栓加固。
- What should I do? Retain the red door? 现在门已经刷上红色了，怎么办?
- I cannot retain so much information. 我不能记住这么多的信息。
