New Words：

escalate [ˈeskəleɪt] v. 逐步升级;不断恶化，加剧

Sample Sentences：

The cost of living is escalating.
We do not want to escalate the war.

New Words：

lift [lɪft] n.电梯；升降机
elevator [ˈelɪveɪtər] n.电梯；升降机

Sample Sentences：

It's on the sixth floor─let's take the lift .
He pushes all the elevator buttons.
There is no elevator in our building.
The elevator doesn't stop at floors 1, 2 and 3.

New Words：

escalator [ˈeskəleɪtər] n. 自动扶梯，手扶电梯

Sample Sentences：

Turn left when you get off the escalator.
Take the escalator to the third floor then turn right.
When taking the escalator, which side should you stand on?