The spread of flu by carrier is akin to flying people or birds, meaning regional variations can spread quickly around the world.
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。
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While both competitors are tailless flying wings powered by single turbofans, the X-47B was designed for carrier operations and features folding wings and a tail hook.