Schoolmates all, the waist and back is straight and upright, two arms overlapping is ready for, listen to a teacher seriously give a lecture.
同学们都腰板挺直，两只胳膊重叠做好，认真的听老师讲课。
Schoolmates all, the waist and back is straight and upright, two arms overlapping is ready for, listen to a teacher seriously give a lecture.
同学们都腰板挺直，两只胳膊重叠做好，认真的听老师讲课。
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