A cookie can store the session id, a session id can be embedded in a form as a hidden value, or a session id can be appended to URLs.

可以用cookie存储会话id，可以把会话id作为隐藏值嵌入在表单中，还可以把会话id附加在URL后面。

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Who's going to buy a cookie for 50 cents when they can buy a donut for half that price?

谁是打算买50美分，饼干时，他们可以购买价格的一半甜甜圈？

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Your browser can either put this number into storage in a cookie locally, or the browser and services can work together to persist the number for the user.

您的浏览器可以将这些数字放到本地的一个 cookie 存储设备中，也可以让浏览器和服务一起来保存用户数量。

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By placing a tracking cookie on a user's computer, an advertising network can collect information about the user's web-browsing activities and use that information to serve online ads targeted to the user's interests or for other purposes.

ENGADGET: Google to pay $22.5 million to settle FTC charges over tracking cookies in Apple's Safari browser

However, for technical reasons, it can't disable a cookie until the user gets back online and goes to a relevant Google site, so full disabling of the tracking files could be a long process.

WSJ: Google to Pay $22.5 Million in FTC Privacy Settlement

Because we already know how to manufacture lots of silicon chips inexpensively using a batch, cookie-cutter approach, we can make micromachines cheaply, sometimes even 100 times cheaper than their traditional counterparts.

FORBES: MicroMachines: They're Huge