selector
noun [ C ] uk/sɪˈlek.tər/ us/səˈlek.tɚ/
选择器
a device that allows you to choose something
a channel/gear/height selector 频道转换器／变速器／高度选择器
UK（运动队的）选拔者
a person who chooses a sports team
His performance persuaded the selectors that he should be included in the team. 他的表现说服了队员选拔人而被吸收入队。