They're small molecules, they're lipid soluble, they can go from extracellular to intracellular.

它们是小分子,并且是脂溶性的,它们能从胞外进入胞内

耶鲁公开课 - 生物医学工程探索课程节选

We've talked about one class of molecules, they're transporters that move molecules from inside to outside, or outside to in, that wouldn't ordinarily be transported through a cell membrane.

我们已经讲过一类这样的分子,它们是能够将分子从胞内运至胞外的载体,或者从胞外运至胞内,这个过程不是简单地穿过细胞膜

耶鲁公开课 - 生物医学工程探索课程节选