Much of the meaning must be inferred from the context.

大部分含意必须从上下文中推断。

I inferred from what she said that you have not been well.

我从她的话里推断出你身体一直不大好。

I inferred from the article that the pilot was responsible for the accident.

我从这篇文章推断，飞行员应对事故负责。

The police inferred, though they didn't exactly say it, that they found her behaviour rather suspicious.

警方虽未明说却暗示他们发现她的行迹相当可疑。

It has to be inferred.

你必须去推测它。