一位微笑的年轻几何老师站在课堂上黑板前,手里拿着一本书,用指针指着黑板,看着前面

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• pose
• person pointing
• pointing
• face
• people
• look
• people standing
• teacher
• citizen
• person standing
• human
• people smiling
• young
• person
• person smiling
• holding
• feelings
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• expression
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• chalkboard
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