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科学
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滑轮和齿轮的用处
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Age 10
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level: 3
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Chinese
Author's Instructions
看图进行配对( Matching the correct answer )
-
科学
-
滑轮和齿轮的用处
-
Age 10
-
level: 3
-
Chinese
Author's Instructions
看图进行配对( Matching the correct answer )
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