同一元素的原子在质量和性质上是相同的。

In economics, the devil is often in the details.

The most controversial thing I have ever done is to stick around.

I do not like proper novels. In proper novels people say things like, ‘I am veined with iron, with silver and with streaks of common mud. I cannot contract into the firm fist which those clench who do not depend on stimulus.’ What does this mean? I do not know. Nor does Father. Nor do the people who write these books.