词汇	past few hours
释义	past few hours 过去的几个小时
随便看	circuit subgroup circuit subspace circuit substrate circuit supervision circuit supervision control circuit switch circuit-switch circuit switch connection circuit switch data transmission service circuit switched circuit-switched circuit-switched access port circuit-switched communication circuit switched connection circuit-switched connection circuit switched data circuit-switched data Circuit-Switched Data link circuit switched data network circuit-switched data network circuit-switched data networkcsdn circuit switched data network, CSDN circuit switched data transmission service circuit-switched data transmission service circuit-switched data-transmission service