subtlety

n. 精妙,明敏

Such philosophical subtleties are beyond my reach.

这种深奥的哲理我可无法理解。

How much easier, how much more satisfying it is for you who can see to grasp quickly the essential qualities of another person by watching the subtleties of expression, the quiver of a muscle, the flutter of a hand.

对你来说，一个能看见的人，通过观察微妙的表情－－－一条肌肉的颤抖、一只手的摆动，很快地了解另一个人的本质，是多么容易又多么令人满足的事情。