名词 selector:

1. a person who chooses or selects out

2. a switch that is used to select among alternatives

selectorn.挑选者；选择器selector rule选择器规则selector disk选择圆盘selector gear选择机构,变速装置selector mode选择方式selector gene选择者基因selector fork变速叉selector knob位置选择旋钮,转换开关selector dial选择器标度盘selector test选择器试验selector disc选择圆盘