因此，在任何时候，相同的用户在不同的机器上登录会得到相同的版本号，但是超期时间不同。
So at any time, the same user logged in from different machines might get the PAC with the same version number but with different expiration times.
例如，如果Linux二进制程序尝试调用uname来得到内核版本，却得到了NetBSD的版本号，这将非常令人迷惑。
For instance, if a Linux binary were to try to call uname to get a kernel version, it would be very confused if it got back a NetBSD version number.
取而代之，它应得到所预期的Linux版本号。
我在交谈中得到的印象是Gmail团队并不怎么在意gmail是否有资格得到具体版本号。
I got the impression from our conversation that the Gmail team does not lose much sleep worrying over whether Gmail is worthy of a specific version number.
从if _ spec获得的版本号是一个32位的值，将之与0xffff进行AND计算可以得到主版本，右移16次可以得到次版本。
The version number retrieved from the if_spec is a 32 bit number which is ANDed with 0xffff to get the major version and right shifted 16 times to get the minor number.
从if _ spec获得的版本号是一个32位的值，将之与0xffff进行AND计算可以得到主版本，右移16次可以得到次版本。
The version number retrieved from the if_spec is a 32 bit number which is ANDed with 0xffff to get the major version and right shifted 16 times to get the minor number.
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