He had better do some research!

他最好做一番调查！

Yes, I think we had better do as you suggest.

是的，我看我们最好还是照你的意思办。

" Then, " said the dwarf, " we had better do what we have to do at once."

“那么。”小矮人说，“我们最好马上就干我们该干的事。”

'Richard Hannay, ' I told myself, 'you have made a mistake, and you had better do something about it.'

“理查德·哈内，这回你错了，最好想办法改过吧。”

" What do you think we had better do" ?

“你认为我们最好做什么”？

If they would rather die. They had better do it.

如果他们宁愿死。他们最好这样做。

Wait a moment whilst I consider what we had better do'.

等一下，我考虑一下我们最好做什么。

And now he was asking Geissler what he had better do next.

现在他问盖斯勒他下一步最好做什么。

Seeing Dick's cheeks reddening a little at this sally, and noting that silence followed, I thought I had better do something.

看到 Dick 的脸颊因为这个出卖而有点发红，并注意到接下来的沉默，我想我最好做点什么。

She kept the note under her wing all day long, wondering what she had better do, but she didn't dare show it to anyone--not even to Stuart.

整整一天里，她都把这便条夹在她的翅膀下面，想知道她该怎么办，不过她不敢把它给任何人看——甚至不敢给斯图亚特看。

" You'd better" this is " had better" , this is used for strong obligation: " You had better do something" means: If you don't do it, there could be negative consequences.

所以：“You'd better” 这是“had better”，用于强烈的义务：“你最好做某事” 的意思是：如果你不做， 可能会有负面后果。