全部 » Close Up » 一个年轻的学生用黑笔在他的方形笔记本上画了一张数学图表。 A young student with a black pen draws a mathematical chart on his squared notebook.

在昏暗的夜灯下，一个年轻的学生拿着一支黑笔，在他们的方形笔记本上仔细地画出了一张数学图表。

Under the dim glow of the night lamp, a young student armed with a black pen meticulously sketches a mathematical chart on their squared notebook.