a strain of avian flu的用法和样例：
例句
- This finding marks the first documented infection of this species with an avian influenza virus.
这一发现标志着首次记载了这一物种感染了一种禽流感病毒。 - The generals of global health assumed that the enemy would be avian flu, probably passed from hens to humans, and that it would strike first in southern China or South-East Asia.
世界各国卫生防疫部门的负责人曾认为，敌人会是一种禽流感病毒，这种病毒很可能是从鸡传染到人身上，并且会首先在中国南部或东南亚爆发。
