在广告期间，屏幕底部会出现一条信息，提示观众按下按钮以请求获得免费样品或订购优惠券或目录。
During commercials, an overlay will appear at the bottom of the screen, prompting viewers to press a button to request a free sample or order a coupon or a catalogue.
它们的价值在于，将它们划分为片断或相关摘录，再把这些片断和搜索广告一起展示给寻找相关信息的人们。
Their value lies in cutting them up into snippets and relevant excerpts, and showing those snippets along with search ads to people looking for related information.
某些免费或低价的应用在设计上都会向用户推送广告：其他一些则会处心积虑盗窃用户的个人信息或跟踪其互联网浏览习惯。
Some free or low cost applications are designed to serve ads to users; others are designed to steal personal information from users or track their Internet browsing habits.
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