On a clear day during the summer the sailors could use the sun at midday to navigate by.

在晴日里，特别是在夏天，海员们能够利用正午头顶上的太阳导航。

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On a clear day during the summer the sailors could use the sun at midday to navigate by.

在晴日里，特别是在夏天，海员们能够利用正午头顶上的太阳导航。

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