New Words：

be able to v. 能够；会
be unable to v.不能够；不会

Sample Sentences：

I doubt they'll be able to help.
You must be able to speak French for this job.
They must be able to speak at least one foreign language.
We may be unable to avoid further earthquakes.

avoid [əˈvɔɪd] v. 避免；避开；防止；回避

further [ˈfɜːrðər]
adj.far的比较级；更远的；更多的；更进一步的
adv.进一步地, 此外

earthquake [ˈɜːrθkweɪk] n. 地震

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