You use meant to to say that something or someone was intended to be or do a particular thing, especially when they have failed to be or do it.
I can't say any more, it's meant to be a big secret.
我无可奉告,这原本是个大秘密。
Everything is meant to be businesslike.
所有的事情原本都应该是公事公办的。
If something is meant for particular people or for a particular situation, it is intended for those people or for that situation.
Fairy tales weren't just meant for children.
童话故事不单单是为孩子们写的。
The seeds were not meant for human consumption.
这些种子并不是给人吃的。
Meant is the past tense and past participle of mean.
be meant to
If you say that something is meant to happen, you mean that it is expected to happen or that it ought to happen.
The peculiar thing about getting engaged is that you're meant to announce it to everyone.
订婚特别要做的事是你应该向每个人宣布你订婚了。
If you say that something is meant to have a particular quality or characteristic, you mean that it has a reputation for being like that.
Spurs are meant to be one of the top teams in the league.
马刺队被公认为是联盟中的强队之一。