用英語幫我說明下豬流感 隨意點就行
豬流感是什麼It is a contagious respiratory disease of pigs caused by type A influenza viruses...
ilearnalotfrom myfriend作文
However， if we negnect it， the deadly H7N9 may cause more infectors，or even more deaths...
豬流感是什麼It is a contagious respiratory disease of pigs caused by type A influenza viruses...
However， if we negnect it， the deadly H7N9 may cause more infectors，or even more deaths...