“轻叩”的英语？

他在讲话前先轻叩了一下扩音器.He gave a tap at the microphone before speaking.有人在轻叩窗户.There was a tap on the window.他轻叩小槌,宣告委员会开会.He rapped his gavel to call the committee into session....

“轻叩”的拼音为：qīng kòu...