常見例句Monitortng and defeet-detecting in dynamic state are performed during the tensile test of elevator links by means of a 2-channel sonud remission instrument. 利用2通道聲發(fā)射分析儀對鉆井吊環(huán)的拉伸試驗進行動態(tài)監(jiān)控與缺陷定位。Thud: the sonud of a feather falling 砰:羽毛落地的聲音knocking sonud (心包)叩擊音 返回 sonud