They have found really no evidence of extensive conquest and destruction in thirteenth and twelfth century archaeological layers.
他们并没有找到大规模占领的证据,十三世纪摧毁和十二世纪考古层的证据。
We'll see why they have to separate that in a minute, but they do that these lipid bi-layers solve that problem for them and they're self-assembled structures from these molecules called phospholipids.
我们马上会讲到为什么要把它们隔离开,脂质双层膜解决了这个问题,而这些自主装结构,就是由磷脂分子组成的
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