| 词汇 | spy on/upon |
| 释义 | phrasespy on/upon ! Spy upon is more formal than spy on, and is mostly used in writing. spy on/upon sb/sth to watch someone or something secretly in order to get more information about them: Carey spied on US diplomats and military officials in Berlin. 'Harriet the Spy'' is a popular children's novel about an 11-year-old girl who spies on her friends and neighbours. |
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