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.

宇宙不仅比我们想象的更奇怪，而且比我们能够想象的更奇怪。

能源的未来是低碳的，但石油和天然气在未来几十年仍将是能源结构的一部分。

"The most important thing is to keep learning and adapting."

你结果的可信度取决于你识别假设的合理性。