These textbooks are not up to date.这些教材不是最新的。

They needed to bring the first edition of the textbook up to date.他们需要更新这部教材的第一版。

It's hard to keep all our records up to date.很难保证我们所有的记载都是最新的。

This memo should bring everyone up to date on the latest changes. [=give everyone the newest information about the most recent changes]这本备忘录会让大家及时了解最新的变化。

She reads the magazines to keep up to date on the latest fashions. [=to know what is fashionable]她阅读这些杂志以紧跟最新潮流。

The styles are not up to date.这些款式不是最新潮的。

The book brings the familiar fable up to date by setting it in the present day.这本书把人们熟悉的寓言故事应用于当今的背景，从而赋予了它新的意义。