Excitement started to percolate through the campus as the game day drew near.

percolate 来自拉丁语 percolare，由前缀 per-（表示"穿过"）和 colare（"过滤"）组成。原意指液体"渗透、过滤"，引申为"逐渐扩散、传播"的意思。这里比喻兴奋情绪像液体渗透一样在校园里逐渐蔓延开来。