pay-per-click       
adjective  business  specialized uk/ˌpeɪ.pəˈklɪk/ us/ˌpeɪ.pɚˈklɪk/
 按客户点击率支付广告费
Pay-per-click advertising involves the person or company that is advertising online paying a particular amount of money every time someone opens their advertisement by clicking on it (= pressing a button on the mouse or keyboard).
  Pay-per-click advertising is the most common form of online advertising.
 Many internet ads are placed on a pay-per-click basis. 许多互联网广告都是按点击付费的。 
 - More examples
 - The social media site offers pay-per-click advertising, where you can target your ads to the most relevant groups and profiles.
 - Under the pay-per-click model, advertisers are charged if a website user clicks on a link.
 - 10% to 15% of clicks billed to pay-per-click advertisers represent fraudulent traffic.