StumbleUpon is a useful tool that lets you mark websites you like, save information for later and find webpages that other users have marked as interesting.

StumbleUpon是一个有用的工具。你可以标记你喜欢的网站，保存信息，发现其他用户感兴趣的网页。

youdao

One of Mark Poster's important presuppositions is language is not transparent tool of action, the other is that subject is constructed in the actions and structures of interchange.

马克·波斯特有两个重要的理论前提，一是语言并非行动的透明工具，二是主体是在交往行动中和交往结构中被构成的。

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To complete the picture, however, you need a special comment syntax to mark special documentation, and a tool to extract those comments and put them in a useful form.

然而，为使一切都整齐划一，还必须使用一种特殊的注释语法，以便标记出特殊的文档；另外还需要一个工具，用于提取这些注释，并按有价值的形式将其展现出来。

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Other non-premium updates include a new Stamps tool that'll let you mark a document with symbols to indicate approval, disapproval, a question mark, an exclamation point and (of course) a heart.

ENGADGET

Neither Facebook nor its founder, Mark Zuckerberg, have said much publicly about Facebook's role as a tool for pro-democracy activists in Tunisia or Egypt.

WSJ: Facebook Seeking Friends In Beltway