She did not understand the relevance of his remarks.
她不理解他
议论与话题有何相干。
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I didn't know what a proton was, or a protein, didn't know a quark from a quasar, didn't understand how geologists could look at a layer of rock on a canyon wall and tell you how old it was, didn't know anything really.

知道什么
质子,什么
蛋白质,
知道夸克和类星体有什么区别,
理解地质学家怎么只要看一眼峡谷壁上的一层岩石,就能说出它的年龄--
确实什么也
知道。