They are now trying to prove the viruses found in lakeice can actually survive well enough to re-infect birds when the ice melts.
他们现在正在努力证明，在湖冰中找到的病毒确实能很好地活下来，在冰融化之时再次感染鸟类。
2
They are now trying to prove the viruses found in lakeice can actually survive well enough to re- infect birds when the ice melts.
他们现在正在努力证明，在湖冰中找到的病毒确实能很好地活下来，在冰融化之时再次感染鸟类。
3
When they tested their theory with Siberian lakeice in 2006, they found an influenza virus almost identical to one that had infected people in the 1930s, and again in the 1960s.