短语讲解：

1. The United States says it is concerned about the Islamic State group attracting recruits and acquiring resources in North Africa.

concern about 使（自己）关心…
例句：She showed great concern about you.
她很为你担心。

2. While this is seen as a success, one U.S. government official says there is concern about recruits coming from Libya and parts of Egypt.

come from 源自; 来自某处; 出生于
例句：Ambient noise may come from any direction.
外界噪声可以来自任意方向。

3. So IS looks for new sources of income.

look for 寻找
例句：I look for you everywhere continuously!
我一直在到处找你！

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