If an activity, situation, etc. involves something, that thing is a part of the activity, etc.

Research involving the use of biological warfare agents will be used for defensive purposes. 与运用生物战手段有关的研究将用来防御。

[ + -ing verb ] The operation involves putting a small tube into your heart. 这项手术需要在你的心脏里放一根小管子。

If a situation involves someone or something, he, she, or it is affected by it.

The second accident involved two cars and a lorry. 第二起事故涉及到两辆小汽车和一辆大卡车。

to include someone in something, or to make them take part in or feel part of it

I prefer teaching methods that actively involve students in learning. 我更喜欢能让学生主动参与学习的教学法。

She's been involved with animal rights for many years. 她多年来一直参与保护动物权益的活动。

It would be difficult not to involve the child's father in the arrangements. 不让孩子的父亲参与筹划会很困难。