vast ocean
definitions
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A very large body of salt water covering a significant portion of the Earth's surface.zh: 广阔的海洋
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A metaphorical expression used to describe an immense quantity, scope, or depth of something abstract.zh: 喻指极大范围
examples
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The explorers sailed across the vast ocean to discover new lands.
探险家们横渡广阔的海洋去发现新土地。
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The universe is a vast ocean of mysteries waiting to be solved.
宇宙是充满待解奥秘的浩瀚海洋。