中子寿命与俘获截面是倒数关系。
Neutron lifetime is inversely related to capture cross section.
复极点的实部是不稳定局域模的能量，虚部是它寿命的倒数，自然地得到了寿命为正的限制。
The real part of the complex pole is the energy of an unstable localized mode, and the reciprocal of the imaginary part is its life-time. Naturally the life-time is positive.
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