今天怎么办……
two birds ,teacher: here are two birds one is a swallow the other one is a sparrow which is which now who can tell us student : l cannot piont out but l know the answer, teacher: please tell us student the swallow is beside sparrow and sparrow is beside swallow
populaion one billion and three hundred million time
今天因为自己的原因,没有记录运动结果

没有很好的完成任务。
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