- echo duration
- 回声: echo; bounce back; reverbera ...
- 宽度: width; breadth; duration
- 回声: echo; bounce back; reverberation; resounding 空屋发出回声。 the empty room echoed. 回声消失了。 the echoes died [faded] away. 这个峡谷以回声而闻名。 the canyon is famous for producing echoes.; 回声测距法 echoranging; echo ranging; 回声测深 echo depth sounding; 回声测深仪 sonic depth finder; acoustic depth finder; echo depth sounding sonar; echo sounder; fathometer; 回声定位 echo location; echo ranging; 回声探鱼法 echo ranging; 回声探鱼仪 acoustic sounder; echo sounder; sonic echo sounder; 回声仪 echometer
- 宽度: width; breadth; duration 宽度十米 ten metres in width; 领海宽度 the extent of the territorial sea; 标准宽度 a standard width; 宽度不一 (in) various widths; of different breadths; 它的宽度为5英尺。 it is five feet in width. 这些钢琴的宽度是不一样的。 these pianos are of different widths
- 高回声,强回声: high-level echo
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