the quality of being unclear or abstruse and hard to understand
noun [抽象名词]难解；深奥
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。
abstruseness
“ -ness” ⌜ 表示状态或质量的性质 - indicating the state or quality of ~ ⌟
