Being something and doing something that no one had done before are two different things.

法律的概念涉及义务的初级规则与承认、变更和裁决的次级规则的结合。

解释：君子所说的话，可靠而且有证据。

Curiosity and persistence are the driving forces behind scientific breakthroughs.

人は誰でも、自分だけの物語を持っている。