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catmouseA cat is running,running.Meow!Meow!一只猫在跑。喵喵!一只猫在跑。喵喵!A mouse is running,running.Chew!Chew!一只老鼠在跑。哧哧!一只老鼠在跑。哧哧!Are they playing?它们在玩吗?它们在玩吗?Are they running?它们在跑步吗?它们在跑步吗?Do you understand?你明白吗?你明白吗?Do you understand?你明白吗?你明白吗?Yes,I do.是的,我明白。是的,我明白。No,I dont.不,我不明白。不,我不明白。Sorry,I dont.对不起,我不明白。对不起,我不明白。20-8=?50+30=?8-7=?10+5=?38-20=?100+100=?1x2=?3x4=?