大意的英文：
general idea
main idea
careless

To the effect that; to the meaning that
意谓;大意是说

It is the careless man that will suffer;never will the prudent man fall into a trap.
只有大意吃亏，没有小心上当。

the tenor of a speech
讲话的大意

the tenor of his speech
他演讲的大意

That is the tenor of his speech.
那是他演讲的大意。

The substance of his speech
他演说的大意

I was able to follow its gist.
我可以听懂大意。

What's the purport of her letter?
她的信的大意是什么?

I caught the drift of what he said.
我懂得他说的大意。

I think I catch your drift.
你的大意我想我懂了。

generalized ensemble
广义系综

general average
共同海损

The steam can generate electricity by turning an electric generator.
蒸汽可以转动发电机发电。

interchange ideas
交换意见,2. 使互相易位,3. 使交替发生,轮流进行,vi.1. 交换位置;交替发生[( with)]

This is a slant idea.
这是个有偏见的想法。

At this moment an idea burst upon him—a glorious idea.
此刻他突然产生一个想法，一个十分美妙的想法。