那匹母马在草地上悠闲地吃草。
The ___mare was grazing peacefully in the meadow.
农场里有五匹母马和两匹小马驹。
There are five ___mares and two foals on the farm.
用小望远镜就能轻易看到月球表面的这片暗色平原。
The dark ___mare on the moon's surface is easily visible with a small telescope.
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