- echo ranging indicator
- 回声: echo; bounce back; reverbera ...
- 测距: range finding; distance meas ...
- 指示器: indicator; pointer; director ...
- 水声测距指示器: acoustic-ranging indicator; hydroacoustic ranging indicator
- 视距测距指示器: stadiametric range indicator
下载手机词典可随时随地查词查翻译