selector
/sɪˈlektə(r)/noun
1- a person or thing that selects something, in particular挑选人, 选择者, 尤指：
1.1
- a person appointed to select a representative team in a sport（体育代表队的）选拔人。
1.2
- a device for selecting a particular gear or other setting of a machine or device选择器, 选择开关, 选择装置。
1.3
- （亦作selecta）Brit. informal a disc jockey (especially in the context of reggae and UK garage music)〈英, 非正式〉（尤指雷盖音乐和英国车库音乐中的）流行音乐节目主持人。