外逸层中空气的密度非常小，以致原子和分子都能逃逸到星际空间。
The air density in the exosphere is so low that atoms and molecules can escape from it into interplanetary space.
磷脂双分子层的内叶在构成上与外叶有很大不同。
The inner leaflet of the bilayer has very different composition than that of the outer leaflet.
外泌体具有磷脂双分子层结构，膜上具有很多蛋白成分，可与细胞膜相互作用。
Exosomes are comprised of natural lipid bilayers with the abundance of adhesive proteins that readily interact with cellular membranes.
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