New Words：

rectangle ['rektæŋgl] n. 长方形；矩形
scaffold ['skæfəld] 脚手架；建筑架；断头台；绞刑架

Sample Sentences：

He handed me a little rectangle of white paper.
Can you draw a rectangle with one hand and a circle with the other?

The worker fell down from the scaffold.
She went to the scaffold when she was 19.

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