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1·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。

2·The author summarizes the debate over the cross-species infection and appropriate research guideline within differ…

因此，对异种移植研究一直存在许多争论。

3·The author summarizes the debate over the cross-species infection and appropriate research guideline within different sc…

因此，对异种移植研究一直存在许多争论。

4·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。

5·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。