The concept of justice is not a legal concept, but a moral one.

Collaboration across industries is key to solving the world's energy challenges.

The discovery of DNA structure was like unraveling a very complex puzzle.

复杂很容易，简单却很难。

伟大的历史是用墨水和鲜血写成的。

爱不过是使用积极强化的另一个名字？或者反过来。