Its brightness changed, getting brighter and dimmer as a function of time.

它的亮度发生了变化，随着时间的推移变得更亮和更暗。

Secondly, I think a problem with this method is that it encourages us implicitly to think of revision as something that is a function of time rather than a function of topics.

其次，我认为这种方法的一个问题是，它隐含地鼓励我们认为复习的重点是时间而不是主题。

The younger people are solely going to take over and so, I think it's a function of time before we get more comfortable as a society with VR. But don't give up on the adults just yet.

年轻人只会接管一切，所以我认为在我们作为一个拥有 VR 的社会变得更加舒适之前， 这是一个时间的函数。 但是暂时不要放弃成年人。