a strain of avian flu的用法和樣例：
例句
- This finding marks the first documented infection of this species with an avian influenza virus.
這一發現標誌著首次記載了這一物種感染了一種禽流感病毒。 - 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.
世界各國衛生防疫部門的負責人曾認為，敵人會是一種禽流感病毒，這種病毒很可能是從雞傳染到人身上，並且會首先在中國南部或東南亞爆發。
