The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.

能源的未来在于发展与可持续性之间的平衡。

Colorless green ideas sleep furiously.

In every exhibition, there is an opportunity to rewrite history, to include voices that have been marginalized or forgotten.

伟大的小说是一个自成一体的世界，有自己的法则和逻辑。