cliff [klɪf]

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n.悬崖，峭壁

a high area of rock with a very steep side , often on a coast

The cliff edge is dangerous and should be railed. 崖边危险，应该用栏杆围起来。
He took the measure of the cliff before he climbed it. 他把悬崖的高度估量一下后再攀登。