It is discovered that under proper condition, the disease would die out without the cross-infection for both species.
揭示了当两种群共存但无疾病交叉传染时，在一定条件下疾病就会消亡的规律。
It is discovered that under proper condition, when the two species coexist and a disease persists in both of them, if the cross-infection is removed, the disease would die out.
结论表明，当两种群共存且均有疾病流行时，如切断疾病交叉传染因素，在一定条件下，疾病均会消亡。
There is no proof yet of safety or danger on cross-species infection in xenotransplantation till now.
目前没有确定的证据表明异种移植是安全的还是危险的。
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