New Words：

criminal [ˈkrɪmɪnl] n. 罪犯
vest [vest] n. 汗衫；坎肩；背心

Sample Sentences：

The criminal is now under the eyes of the police.
It took the police more than a year to track down the criminal.
We try to catch the criminal but he's smart. We're always one step behind.

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