她富有感染力的热情迅速传遍了房间里的每个人。

Her ___infectious enthusiasm quickly spread to everyone in the room.

积极情绪常常具有感染力，让其他人也感到更快乐。

Positive emotions are often ___infectious, making others feel happier too.

那位喜剧演员富有感染力的笑声让全场观众捧腹大笑。

The comedian's ___infectious laughter had the entire audience in stitches.