A person needs to walk how many roads to become a real person.

The automotive industry is undergoing unprecedented changes, which is an opportunity for Chinese automakers.

Collaboration is the key to solving the world's most pressing problems.

在量子力学中，轨迹的概念失去了意义。

The fact is that every writer creates his own precursors. His work modifies our conception of the past, as it will modify the future.