New words：

within [wi'ðin] prep. 在(某段时间、距离或范围)内, 在…里面

Sample Sentences：

I'll be coming within an hour.

They finished the house within half a year.

You should receive a reply within seven days.

Several cars are available within this price range.

available [ə'veiləbl] adj.可获得的；可购得的；可找到的；有空的
avail [ə'veil] v.有用；有帮助；有益

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