abstruseness

Milnor is also known as a great expositor, whose books are low on abstruseness and high on simple, common-sense explanations.

米尔诺尔也是一个伟大的解说者，他的书不会很深奥，更多的是简单、常识性的解读。

Yesterday is hiadventure. Tomorrow is abstruseness.

昨天已成为历史。明日却仍然是谜。