contagious adj. a contagious disease spreads from one person to another
through touch or through the air. 传染性的
contagiously adv. 传染性地
yawn v. to open the mouth wide and take a lot of air into the lungs and slowly send
it out, usually when tired or bored. 打呵欠
看见人打哈欠，狗狗也常会传染性地打哈欠。
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