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1·The radiation exposure in Hiroshima and Nagasaki was a short-lived, intense, exposure to relatively high doses of penetrating radiation.

广岛和长崎的核辐射是较高剂量的穿透性辐射，持续时间短、强度大。

2·This cascade of absorption and scattering stops harmful radiation from penetrating to body tissues.

这一连串的吸收与散射，阻止了有害辐射穿透至人体的组织。