This file defines four roles: manager, librarian, student, and visitor.

这个文件定义4个角色：manager、librarian、student和visitor。

youdao

Sometimes a simple tip or explanation can prevent error and visitor frustration.

有时候简单的一条提示或解释就能避免错误和访客受挫。

youdao

As such, a recommender must be able to accommodate the active participation of both the place-owner and visitor.

因此，一个推荐系统必须能够容纳积极参与其中的网站所有者和访客两方。

youdao

The first park to charge a visitor fee was Mount Rainier in the northwestern state of Washington in nineteen hundred and eight.

VOA: special.2009.09.28

And it was the best part of the Kinsey Collection for visitor Aaron Crenshaw, of Woodbridge,Virginia.

VOA: special.2011.02.11

"'Tis some visitor," I muttered, "tapping at my chamber door -- Only this and nothing more."

VOA: special.2010.10.31

Best of all, the new program is financed by industry and visitor fees, not taxpayer dollars.

FORBES: Destination: USA

He said 15% of the economy, such as shops, pubs, restaurants and visitor attractions do well.

BBC: Bank holidays 'cost economy ?19bn'

The decision was hugely popular and visitor numbers have almost doubled at many places.

BBC: Tourist venues call for free entry help