骑手在草原上骑着马。
The rider is on the ___prairie with his horse.
草原上成群的野牛在广阔的大草原上自由漫步。
Herds of bison roam freely across the vast ___prairie.
他的办公桌就像一片散乱文件和便利贴的草原。
His desk was a ___prairie of disordered documents and sticky notes.
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