bleacher

n. 漂白业者, 漂白剂, 露天看台
【化】 漂白机; 纸浆漂白机
【医】 漂白器

bleach.er

n.（名词）
One that bleaches or is used in bleaching.
漂白工人或漂白剂
Often bleachers An often unroofed outdoor grandstand for seating spectators.
常作 bleachers 露天看台：一种常为无顶的露天观众大看台

来源：
[Sense 2, from comparing a person`s exposure to the sun when sitting on them with the exposure of linens bleaching on a clothesline]
[释义二，由坐在大看台而暴露在太阳下比作晒衣绳上被晒白的亚麻布而来]