exposes是什么意思？

It exposes him to oily smoke all day long.

The Internet] exposes them to more thinking," he says, "and groups that are like-minded in different parts of the country start to come together.

Failure to address comprehensively the problem of greenhouse gas emissions, however, exposes all generations, present and future, to incalculable risks.

For example, in one chapter she exposes a myth that I've heard taught by university physics professors.