permanent tone 中文意思是什麼
permanent tone
解釋
不掛機音-
Just under 3 feet in diameter and weighing 45 pounds, the black circular device emits an intense 15 - to 30 - degree - wide acoustic beam - - a high - pitched shrill tone similar to a smoke detector alarm - - that can easily cause permanent auditory damage at close range
僅僅在3尺之下在直徑中的秤重45磅,黑色的圓形裝置發出強烈的15 -達到30程度-寬的聽覺光線- -一尖銳的尖銳聲音明暗相似的對煙發現者警報- -那能容易地因素燙發聽眾席損害在結束范圍。
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