1. 武装入侵;侵略
    If there is an invasion of a country, a foreign army enters it by force.

    e.g. ...seven years after the Roman invasion of Britain...
           罗马人入侵英国7年以后
    e.g. He was commander in chief during the invasion of Panama.
           在侵略巴拿马的战役中他是总司令。

2. (令人不快的或难以对付的人或事物的)大批进入，涌入
    If you refer to the arrival of a large number of people or things as an invasion, you are emphasizing that they are unpleasant or difficult to deal with.

invasion的意思

    e.g. ...this year's annual invasion of flies, wasps and ants...
           今年，苍蝇、黄蜂和蚂蚁同往年一样的大批进犯
    e.g. Seaside resorts such as Blackpool and Brighton are preparing for a tourist invasion.
           像布莱克浦与布赖顿这样的海滨胜地正为游客的大批涌入做准备。

3. 侵扰;干扰
    If you describe an action as an invasion, you disapprove of it because it affects someone or something in a way that is not wanted.

invasion的意思

    e.g. Is reading a child's diary always a gross invasion of privacy?
           偷看孩子的日记一定是对个人隐私的严重侵犯吗？
    e.g. ...the first skirmish in the invasion of the British Parliament by Brussels.
           布鲁塞尔干扰英国议会的首次摩擦