Adding to the underground feel of Facebook was the viral spread of the site.
Facebook给人以地铁的感觉，也是因为网站的快速传播。
Chikungunya is a viral disease that is spread by mosquitoes.
基孔肯雅热是一种通过蚊子传播的病毒性疾病。
Viral infections such as a common cold or flu can spread to the labyrinth.
病毒感染，例如作为一个普通感冒或流感，可以蔓延到迷宫。
Viral infections such as a common cold or flu can spread to the labyrinth.
病毒感染，例如作为一个普通感冒或流感，可以蔓延到迷宫。
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