New Words：

pause [pɔːz]

v.暂停；停顿；
n.停顿；暂停键；

professor [prəˈfesər] n. 教授;(大学的)讲师，教员

Sample Sentences：

Pause the video and answer the question.
He paused when he heard steps behind him.

She spoke for an hour without a pause.
After a short pause, he continued climbing.

He is a professor of history.
My uncle is a professor in this university.

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