Alan Barrett of the University of Texas says travel by carriers of influenza, be they people in aeroplanes or birds on the wing, means regional mutations quickly spread around the world.
德克萨斯大学的阿兰·巴瑞特说，流感通过载体的传播就像是人们坐飞机或是鸟儿飞翔一样，意味着区域变异会很快传播到世界各地。
And to spread wing and fly in the outer air.
我欲双翅展，飞行在外面。
All farmed chickens, turkeys, and pigs spend their brief lives in dark and crowded warehouses, many of them so cramped that they can't even turn around or spread a single wing.
大部分农场里的鸡，火鸡，和猪，短暂的一生都生活在黑暗狭小的空间里，它们生活得如此拥挤，甚至不可能转身，或伸展开单只的翅膀。
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