Service aggregation is a vital function.

服务聚合是一项重要的功能。

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So the high performance phase shifter has vital function in these systems.

因此高性能的移相器在这些系统中起着至关重要的作用。

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Controlling the size of mail databases is a vital function of managing an IBM Lotus Domino environment.

控制邮件数据库的大小是管理IBM Lotus Domino环境的一项重要功能。

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Community banks serve a vital function all across the country.

WHITEHOUSE: President Obama Speaks After Meeting with Community Bank CEOs | The White House

The 50, 000-plus wells other firms have successfully drilled in federal waters of the Gulf offer further evidence of how rare these instances are in an industry that serves such a vital function in the U.S. economy.

FORBES: BP Culture Made Gulf Spill Inevitable

And while the process is important and it's a vital function of our democracy -- the confirmation process -- I would be stunned if, in the end, Republican senators chose to try to block the nomination of a decorated war veteran who was once among their colleagues in the Senate as a Republican.

WHITEHOUSE: Press Briefing