to enter a country by force with large numbers of soldiers in order to take possession of it

Concentrations of troops near the border look set to invade within the next few days. 部队在边境附近集结，看来几天内必定会入侵。

to enter a place in large numbers, usually when unwanted and in order to take possession or do damage

Hundreds of squatters have invaded waste land in the hope that they will be allowed to stay. 数百名擅自占地的人涌入荒地，希望能被允许留在那里。

to enter an area of activity in a forceful and noticeable way

Maria looks set to invade the music scene with her style and image. 看来玛丽亚准备好了要凭借她自身的风格和形象打入音乐界。

to spoil a situation or quality for another person without thinking about their feelings

Famous people often find their privacy is invaded by the press. 名人常常发现个人隐私受到新闻界的侵犯。