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- One outer membrane envelops both amniotic sacs. 两个羊膜囊由一个外膜层包裹。
- Cross-cuts of cilia showing the typical 9X2 +2 arrangement of microtubules within the cytoplasm ( ring of 9 doublets plus 2 single microtubules in the center). The cell membrane envelopes each cilium. 纤毛横切面显示了典型的9X2+2微管排列结构（环绕周边的9组二联微管加中间两条单独的微管。胞膜覆盖在纤毛表面。
- The membrane envelope isolates the contents from the surrounding cytoplasm. 这些小泡依赖封闭的外膜得以与细胞质相独立而存在。
- A. Identical Twins Fetuses are of the same sex and share one placenta. One outer membrane envelops both amniotic sacs. 同卵双胞胎性别相同，并共享一个胎盘。两个羊膜囊由一个外膜层包裹。
- The younger bacteroid was elliptic and had a similar nucleus region in cell. The normal bacteroid had an intact membrane envelope and PHB granules. 幼年美菌体为椭圆形，里面有个拟核区，正常类菌体有完整的周膜和PHB颗粒。
- The papers are falling out of the envelop, push them back. 论文从封袋里掉出来了，把它们放回原处。
- A thin layer of bone, membrane, or other tissue. 骨骼、粘膜或其它组织的薄层
- He steamed the valuable stamp off the envelop. 他用蒸汽熏揭下信封上的邮票。
- Addressing envelopes all day long is dreary work. 成天给信封写地址是一种沉闷单调的工作。
- membrane envelopes 包膜
- Addressing envelopes all the time is dreary work. 成天给信封写地址是一种沉闷单调的工作。
- Hard times affect pay envelopes. 经济低潮会影响薪水。
- I went and bought some envelopes. 我去买了一些信封。
- A thin skin or film, such as an organic membrane or a liquid film. 薄皮，薄膜如生物膜或液体膜等细薄的皮或膜
- A tightly stretched sheet or membrane, as on the head of a drum. 绷紧的薄膜状物挤压得很紧的平板或薄膜，如鼓面
- Lady: I want some envelopes please. 女士：我想买些信封。
- Where are the envelopes and stationery then? 那么信封和文具在哪里?
- A vibrating membrane in the ear helps to convey sounds to the brain. 耳膜的振动帮助声音传送到大脑。
- Keep and control the work order collection envelop. 保留并保管工作单收集信封。
- I would like some notepaper and envelopes. 我要一些信纸和信封。
