In some places the math gets quite complicated, but he always wraps things up by making sure you're still with him.
在某些地方，数学原理变得很复杂，不过他的讲解方式能确保你跟上他的思路。
The book-worm wraps himself up in his web of verbal generalities, and sees only the glimmering shadows of things reflected from the minds of others.
书虫们把自己包括在词语的网络中，他们所见的只是别人思想反射的光影。
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