名詞 subtlety:

1. a subtle difference in meaning or opinion or attitude
   同義詞：nuance, nicety, shade, refinement
2. the quality of being difficult to detect or analyze
   同義詞：niceness

1. 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.
   對你來說，一個能看見的人，通過觀察微妙的表情－－－一條肌肉的顫抖、一只手的擺動，很快地了解另一個人的本質(zhì)，是多么容易又多么令人滿足的事情。
2. Such philosophical subtleties are beyond my reach.
   這種深奧的哲理我可無法理解。