I considered some of the awful things my grandparents and great-grandparents had seen in their lifetimes: two world wars, killer flu, segregation, a nuclear bomb.
我想到了祖父母和曾祖父母在世时遇到的可怕事情：两次世界大战、致命流感、种族隔离、核弹。
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Neutron irradiation-induced phosphorus intergranular segregation in the reactor pressure vessel steels is the one of main reasons resulting in brittle fracture of the nuclear reactor vessel.