7 W) N N* ?2 d; X! D' U5 J不难看出,考虑以上几条假设,可得:7 Q4 s8 c) K" t, y# N* u1 A5 X7 g
: d' d1 G8 u U2 H
每个病人每天可使λs(t)个健康者变 4 | L' i3 J$ V4 j( B) {( j: u# L' {/ O9 I, ^/ f. Z
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