... fathomscale测深比例尺 fathom测深拓 fathom拓 ...
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测深拓
Sounding extension
以上为机器翻译结果，长、整句建议使用 人工翻译 。
雾起，立即召唤船长，开始保持每20分钟用雷达环扫一次海面，回声测深52拓，备车，开启雾号。
Fog sets in, call master at once. Began to keep on radar for detecting to the sea all round at an interval of every 20 minutes. Sounding by echo 52 fathoms. Standby Engine. Fog signal started.
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