... echo-fathom 回声测深 fathom a sea 测海深 fathom curve 等深曲线; 等深线 ...
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When passing One Fathom Bank, check the depth and variable sand waves below the sea level all the time by echo sounder.
通过一托浅滩时，要一直测深校时水深及海面下多变的沙纹。
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