音标发音英式音标 [θaɪˈrɪs.tər]美式音标 [θaɪˈrɪs.tɚ]英式发音 美式发音 基本解释（电子）晶闸管。同根派生 英英字典剑桥英英字典 a device, usually a semiconductor, that is used as a switch to control the amount of electricity passing through a particular point