infectiousness

Unfortunately, swine flu's infectiousness and the globalized flow of human travel make for a very dangerous combination.

不幸是，猪流传性和人员流动全球化形成了一个非常危险组合。

Catches an illness the flowering branch to have the mutual infectiousness, but died of old age the flowering branch is easy to have the ethylene acceleration deterioration.

病有互性，而凋谢易产生乙烯加速衰败。