大家好！我叫刘雅澜，是中古友谊小学四年级的学生。

Hi, everyone. I'm Liu Yalan, you can call me Lydia. I come from Sino-Cuba Friendship Primary School.

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我叫刘玲，1990年毕业于南开大学数学系并获得理学士学位。

My name is Liu Ling. I graduated in 1990 from Nankai University majoring in mathematics with a BS. degree.

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