Pay-per-click advertising is not without its problems-especially "click fraud", the practice of generating bogus clicks for devious reasons, such as making a rival advertiser pay for nothing.

点击付费广告也不是没有缺陷-特别是“点击欺诈”，以某种不正当的原因产生的欺诈性的点击，比如为了让竞争对手的广告失效。

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Customers who sign up for a bundle of services and its associated discount cannot defect to a rival provider of any one of the services without losing the discount.

消费者只要认购了打折后的捆绑式服务，就不会去选择竞争对手的任何单一的无折扣服务。

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Yet Brown believes Quora could still reshape the Web without becoming a blockbuster to rival Yahoo Answers.

但是，Brown相信，Quora仍将重塑网络而不是成为雅虎问答的对手。

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The New Criticism, incontestably and without rival, created an atmosphere in which it was okay to notice that things were a little more difficult than they'd been supposed to be.

新批评派，无可厚非，创造了一种很好的风气，大家似乎都能欣然接受,那些看起来还比较复杂的东西。

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Naturally then, Facebook would want people to be able to click to send a text message or phone call without leaving to a rival service.

FORBES: Facebook Adds Voice Messages, Tests VoIP Calls

Lebanon has been without a president since November, as rival factions argue over who should fill the post.

BBC: RELATED BBC SITES

The hard truth is that Mr Ventura, who won 37% of the vote and beat his closest rival by a mere three percentage points, is a victor without a mandate.

ECONOMIST: Jesse��s new job | The