essential quality的用法和樣例：
例句
- 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、一隻手的擺動，很快地了解另一個人的本質，是多麼容易又多麼令人滿足的事情。 - Her most essential quality is kindness.
她最主要的品質是善良。
