1. 间谍
    A spy is a person whose job is to find out secret information about another country or organization.

    e.g. He was jailed for five years as an alleged British spy...
           他被指控为英国间谍，入狱关押了 5 年。
    e.g. The spy ring passed secrets to the enemy.
           该间谍团伙向敌方传送秘密情报。

2. (卫星、飞机)执行间谍任务的
    A spy satellite or spy plane obtains secret information about another country by taking photographs from the sky.

spy是什么意思

3. 从事间谍活动;充当间谍
    Someone who spies for a country or organization tries to find out secret information about another country or organization.

spy

    e.g. The agent spied for East Germany for more than twenty years...
           该特工人员为东德做了 20 多年的间谍。
    e.g. East and West are still spying on one another...
           东西方仍在互相进行间谍活动。

4. 秘密监视
    If you spy on someone, you watch them secretly.

spy的反义词

    e.g. That day he spied on her while pretending to work on the shrubs...
           那天，他假装在修剪灌木，秘密对她进行监视。
    e.g. He had his wife spied on for evidence in a divorce case.
           他请人秘密监视自己的妻子，为离婚案搜集证据。

5. 看见;发现
    If you spy someone or something, you notice them.

    e.g. He was walking down the street when he spied an old friend.
           他正沿街走着，突然看见了一位老朋友。