In 1996, geese in poultry farms in the Guangdong province of southern China started to get sick with a virus causing “bleeding and neurological(神经系统的) dysfunction(功能障碍)” and then death.
1996年，中国南部广东省家禽养殖场里的鹅开始感染一种病毒而生病，出现“出血和神经功能障碍”，随后死亡。
A strain(菌株，毒株) of avian influenza had likely arrived as a relatively harmless virus in migrating wild birds but had morphed into something “highly pathogenic(致病的，病原的)”, killing about 40% of infected geese.
一种禽流感病毒株很可能最初是作为相对无害的病毒，通过迁徙的野生鸟类传入，但后来变异成了“高致病性”病毒，导致约40%的受感染鹅死亡。
Now, after appearing and disappearing, evolving and mutating and traversing the planet – leaving millions of dead birds and mammals in its wake(在…之后，紧随…) – a descendant(后代，后裔) of that same H5N1 virus is, 30 years later, killing wild birds in Australia.
如今，在出现又消失、进化又变异、横跨全球——留下数百万只死鸟和哺乳动物——30年后，那个H5N1病毒的后代正在澳大利亚杀死野生鸟类。
Evolving and mutating
进化与变异
Jump to mammals
传播到哺乳动物