| 单词 | 回声测深 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔depth sounder〕An ultrasonic instrument used to measure the depth of water under a ship.回声测深仪：用来测量船下水深的超声设备美国传统〔echo sounder〕A device for measuring depth of water by sending pressure waves down from the surface and recording the time until the echo returns from the bottom.回声测深器：一种通过向水面发射压力波，并记录水底反射回波到达原发射地的时间来测量水深的仪器美国传统 |
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