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制造链式反应机器的根本点当然是确保每次裂变产生一定数量的中子,其中一些中子将再次产生裂变。
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.
Stories are not just entertainment. They are the way we understand the world and our place in it.
I wonder how many people I've looked at all my life and never seen.
"I don't think that literature should be a moral institution."