We'll be talking about the fact that this is an interval of a third; it spans three letter names a little bit later on.
我们以后会谈到,这其实是个三度音程,它跨越了三个音名
Essentially, what they are is it's a protein that spans the membrane of a cell.
本质上来说,它是一个横跨细胞膜的蛋白质。
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