介入的英文：
intervene
get involved

Step in
插入,介入

A well-timed intervention
及时的介入.

An actor's foray into politics.
一演员对政治的尝试性介入。

UN peacekeepers quickly intervened to soothe tempers.
联合国维和部队迅速介入，平息双方的怒火。

A mistimed intervention
不合时宜的介入

He never gets involved in unprincipled disputes
他从不介入无原则的争端。

You'd better not intervene in their dispute.
你最好还是不要介入他们的争端。

He began to wish himself out of the affair.
他开始希望自己未介入那件事。

If no agreement was reached, the army would step in.
如果无法达成协议，军队将会介入。

Let such trifle not intervene between us.
不要让这样的小事介入我们之间。

I will come if nothing intervenes.
假若没有别的事，我一定来。

You'd better not intervene in their dispute.
你最好还是不要介入他们的争端。

I am powerless to intervene in the matter.
我对调停此事无能为力。

Get to the bottom of
弄个水落石出

Saving is getting
节约等于收入

It was getting dark.
天色渐暗。

Involved or intricate, as in structure; complicated.
复杂的在结构中牵扯较多的或错综复杂的；复杂的

It's derivation involved no approximation.
这种近似方法的适用性将在后面再讨论。

There was no motive of sexual involvement.
没有牵涉性方面的动机。