The URL of the document in XML form, the unique ID (for tracking purposes), and a property ID.

XML表单中的文档的URL、唯一标识(用于跟踪)和一个特性标识。

youdao

Third-party cookies: These are usually used for tracking purposes by a site other than the one you are visiting.

第三方cookie：它们经常被站点用于跟踪目的。

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Add or remove work item fields for tracking purposes, or change the field labels to support your team's naming conventions.

加入或移除工作项目栏位以利追踪，或是变更栏位标签以支援小组的命名惯例。

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As you might expect, the wearable touts Bluetooth for connecting to your smartphone and an accelerometer for tracking purposes.

ENGADGET: LG's Smart Activity Tracker wields a swipeable touchscreen and smart TV apps, we go hands-on (video)

And the murky question of tracking users for law enforcement purposes?

FORBES: Ask.com's Search Policy Splits Privacy Groups

One big obstacle in winning more of that business was Google co-founder Mr. Page, who objected to letting Google's advertising customers work with companies that installed "cookies" on people's computers for purposes of serving ads and tracking their performance.

WSJ: Google Agonizes on Privacy as Advertising World Vaults Ahead