Data sets released by app developers looking to drive downloads and smaller marketing agencies, meanwhile, have been unreliable at best.

同时，应用开发人员则希望增加下载量，他们和小型市场代理机构发布的数据集，就算往好里说，也靠不住。

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The bigger risk now is from "drive-by" downloads – malware (malicious software) that will try to infect Windows machines that visit a particular website by exploiting vulnerabilities in the browser.

更大的威胁在于“强迫”下载——恶意软件能够感染Windows操作系统的电脑，利用浏览器弱点链接到特定的网站。

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In the new millennium, the most common form of malware attack has become known as drive-by downloads.

CNN: Facebook, Twitter crooks just a click away

According to a study by Google researchers last February, more than 3 million out of 60 million pages analyzed were found to perform "drive-by downloads, " invisibly installing malicious software on users' machines.

FORBES: Magazine Article

In several recent cases, hackers have infected hundreds of thousands of Web servers with software that performs "drive-by downloads" on any visitor's machine, installing password-stealing Trojans or turning the PC into a spam-spewing zombie.

FORBES: Magazine Article