应该
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最好；应该（用于建议、警告、威胁、发表意见等）
had better do
最好做
had better do something
最好做某事；应该做某事
This means we don't eat meat, and any milk or cheese had better be dairy-free.
这意味着我们不吃肉，任何牛奶或奶酪最好都是无乳制品的。
If you are a sugar addict and aren't able to say no to chocolate or cola, you had better download it now!
如果你是糖瘾者，不能拒绝巧克力或可乐，你最好现在就下载它！
In order to show our respect(尊重) for others, we had better listen to them first.
为了表示对他人的尊重，我们最好先倾听他们。
Had better so sth better
最好做某时
You had better buckle down!
你最好多用心！
had better
had better是一个英语词组，意思是最好，可将其视为“情态”动词，可用于一切人称，没有任何词形变化。其后接不带to的不定式，表示现在或将来的概念。
