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A:老乙,中央台今天广播了飞机定寿问题,您说,咱们图书馆里的书刊是不是也有个定寿问题?乙:我看有,半衰期不就是专给书刊定寿的吗?
A: Old B, CCTV broadcast aircraft scheduled life today, you said, our library books also have a fixed life problem? B: I think there is, half-life is not dedicated to book Dingshou it?