New Words：

cliff [klif] n. 悬崖, 峭壁
nightmare ['nait.mer] n. 恶梦；梦魇；极其糟糕的情况

Sample Sentences：

It's almost impossible to climb up the cliff.
There are very few holds on the cliff face.
I have nightmares about falling off a cliff.
Her first few days in that foreign land were a total nightmare.

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