能源需求与环境保护之间的平衡是我们这个时代的挑战。
The balance between energy needs and environmental protection is the challenge of our time.
追求物理学的统一理论不仅仅是一项学术活动；它是理解现实本质的旅程。
I believe that science has great potential to improve human life.
宇宙是一个相当大的地方。如果只有我们，那似乎是对空间的极大浪费。