Blue Sky Moon: the dark areas are known as lunar seas because they were once believed to be filled with water.
蓝天月球：黑色的区域叫做月海，因为人们曾经以为那里面全是水。
The wahoo is a dark blue scombrid fish found in tropical and subtropical seas.
刺鲅是一种深蓝色的鲭科鱼，分布在热带和亚热带海域。
Explanation: Dark, smooth regions that cover the Moon's familiar face are called by Latin names for oceans and seas.
说明：在月球表面上较黑暗、平滑的区域，是以拉丁文的海洋来命名。
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