infectious

adj.有传染性的,易传染的,有感染力的

1. 传染性的；有感染力的；2. （笑声、笑容等）乐观的；活泼的；

形容词；

1. Measles is a highly infectious disease that spreads easily among unvaccinated individuals.
麻疹是一种高度传染性的疾病，易于在未接种疫苗的人群中传播。
2. Her laughter was infectious, and soon everyone in the room was laughing along.
她的笑声很具感染力，很快房间里的每个人都跟着笑了起来。