a device for controlling something such as the volume of a radio, which you slide up and down or from side to side （控制收音机音量等的）滑杆，滑动器 - (
computing 计算机 an icon that you can slide up and down or from side to side with the mouse 浮动块；滑动条；滑块 a freshwater turtle from North America 红腹彩龟（北美淡水龟）