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The plane geometry is one of middle school mathematics basic contents.
平面几何是中学数学的基本内容之一。
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They booked a block of seats in the middle of the plane .
他们包租了飞机客舱中部的一组座位。
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They booked a block of seats in the middle of the plane .
他们包租了飞机客舱中部的一组座位。
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