难理解的;晦涩难懂的
Difficult to understand; Obscure and difficult to understand
以上为机器翻译结果，长、整句建议使用 人工翻译 。
事实上，我们上节课提到过，当时很多的哲人都提出万有引力是晦涩难懂的，即便是机械论的因果关系也是非常难理解的。
So, in fact, not only is gravity unintelligible as we saw last time many philosophers at the time wanted to say, actually even mechanical causation is pretty unintelligible too.
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