backscatter什么意思？

At last, the recent development of ultrasonic backscatter imaging is reviewed.最后, 简要介绍了超声背向散射成像的新进展.Officials at the Transportation Administration say they have already tried out a handful of backscatter scanners.运输安全局的官...

backscatter的音标：backscatter的英式发音音标为：['bækˌskætə]backscatter的美式发音音标为：['bækˌskætə]...