New words：

rate [reit] n. 率；速度；比率；价格

Sample Sentences：

We drove at a steady rate.
The school has a 90% pass rate.
What's the rate for a single room?
House prices are rising at a higher rate than before.
Most people walk at an average rate of 5 kilometres an hour.

average ['ævəridʒ]
n.平均水平；平均数；一般水准
adj.平均的；典型的；正常的；普通的

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