witness　　vt. 目击，当场见到；作证，证明　　n. 目击者，证人，证据　　Police have appealed for anyone who witnessed the incident t......

surround　　vt. 包围，围住；在……周围，环绕　　The police surrounded the house.　　警察包围了那栋房子。　　You should prevent......

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