A security token can be any value but is typically a symbol, a canonical string that does not exist anywhere else.
一个安全令牌可以是任何值，但通常是一个不在其他地方存在的符号或者规范的字符串。
This operation expects a string, to be interpreted as a ticker symbol for a stock, and returns a current quote for that stock, a float value.
该操作等待一个字符串，被解释为股票的报价机符号，然后返回当前该股票报价，一个浮点值。
The KERN_INFO symbol is a string that you can use to filter information from entering the kernel ring buffer (much like syslog).
kern_info符号是一个字符串，可以用来对进入内核回环缓冲区的信息进行过滤(非常类似于syslog)。
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