单词swimmer-s-ear
He knew a waterproof earplug would also help prevent the painful outer ear infections known as "swimmer"s ear" .
他还知道一款防水的耳塞还能预防外耳疼痛而感染中耳炎。
Swimmer"s ear is an infection of the outer ear canal.
游泳性耳炎是一种外耳道感染。