knurling的音标：knurling的英式发音音标为：['nɜ:lɪŋ]knurling的美式发音音标为：['nɜlɪŋ]...

Electric heater or ultrasonic knurling device can be installed.可选装电热或超声波滚花装置....

n.滚花，压花纹...