名词
中文翻译：海图
同义词：
['chart', 'nautical chart', 'navigational chart']
例句：
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1.The sailors used the hyetogram to plot their course.
水手们使用海图来规划他们的航线。
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2. The captain consulted the hyetogram before setting sail.
船长在启航前查阅了海图。
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3.The old map was a valuable resource for navigating the ocean.
旧地图是航海导航的重要资源。