Plastics are usually marked with an identification code that shows a recycling symbol and a number from 1 to 7.

塑料通常标有一个标识码，上面有一个回收符号和一个从1到7的数字。

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The result is then combined with the symbol quote into a list so that Scheme will treat it as a literal value when it becomes code.

然后，结果与符号 quote 合并到一个列表中，这样 Scheme 就会在将其转换成代码时将其作为一个文本值进行处理。

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These special identifiers all start with the $ symbol, so they're not going to interfere with anything you'd otherwise do in your code.

这些特殊标识符以符号 $ 开头，所以它们不会干扰代码中的其他内容。

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Along with Motorola, Connect Things and bar code giant Symbol Technologies, AirClic has raised half a billion dollars to form a company that will put scanning technology into wireless devices.

FORBES: Scanned Goods