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Atomic safety has gone far beyond such crude beginnings, but a risk-free reactor has yet to be built. 防原子的安全措施現(xiàn)已遠(yuǎn)非初時(shí)那樣粗陋簡(jiǎn)拙的樣子，但是完全沒有危險(xiǎn)的反應(yīng)堆尚有待脩建。