Tour America acts as an agent for other vendors and cannot be held responsible for any delays.

“巡游美国”充当其他卖主的代理商，它对任何延误不承担责任。

《柯林斯英汉双解大词典》

In the reaction, the fraction ACTS as an agent.

在反应中，这些碎片起一种媒剂的作用。

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This lets us focus on the Web caching specifically and make it function as a forward proxy that acts as an agent for the Web browser.

这样我们就可以集中精力专攻万维网高速缓存部分，把它安装成正向网络代理器，它相当于网页浏览器代理器。

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Groupon acts as an agent between merchants and consumers.

FORBES: Memo to SEC: End Groupon's Shady Accounting

Egham-based Hotels4u.com acts as an online booking agent for hotels, apartments and villas.

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