n.傳染病；接觸傳染；蔓延
Tuberculosis is respiratory tract contagion. 肺結(jié)核是呼吸道傳染病。
Fear spread through the crowd like a contagion. 人們心中的恐懼像瘟疫一樣蔓延開來。
Some diseases spread by contagion. 有些疾病藉傳染蔓延。
