| 单词 | hydrography | 
| 释义 | Word Frequency hydrography(haɪˈdrɒɡrəfɪ) noun 1.  the study, surveying, and mapping of the oceans, seas, and rivers Compare hydrology 2.  the oceans, seas, and rivers as represented on a chart  Derived formshydrographer (hyˈdrographer) noun | 
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