深奥难懂用英语怎么说

深奥难懂用英语可以翻译为 "profound and difficult to understand". 这个词来源于拉丁语 "profundus" 和 "difficilis", 分别表示 "深的" 和 "难的". 一些英文例句及其中文翻译如下：

The professor's lecture on quantum mechanics was profound and difficult to understand. (教授关于量子力学的演讲深奥难懂。)
The novel's themes were profound and difficult to understand. (小说的主题深奥难懂。)
The philosopher's writings were profound and difficult to understand. (哲学家的著作深奥难懂。)