当t cp的慢速计时器每隔500毫秒计时到期的时候，将调用tcp_slowtimo。
When TCP's slow timer expires every 500ms, tcp_slowtimo gets called.
在测量键释放时间（大多数是几百毫秒）时，极有可能无法匹配精确到毫秒的键释放计时。
When measuring intra-key release times, most often in the hundreds of milliseconds, it is highly unlikely to match the precise millisecond of the key release.
如果密码之间的击键差异小于maxKeyDiff阈值（100毫秒），则认为计时是匹配的。
Timings are considered a match if the differences between the keystrokes across passwords are less than the maxKeyDiff threshold (100 milliseconds).
如果我在测量的时候,需要把精度控制在2%以内,则计时的精度,就得大约1/10毫秒,因为1/10毫秒正好是,5的。
And if I want to make a measurement to two percent accuracy I have to know this timing to about one-tenth of a millisecond because one-tenth of a millisecond 2% is about two percent of five.
其结果就是在用户停止了键入之后，计时器停止200毫秒。
The result is that the timer goes off 200 milliseconds after the user has stopped typing.
当该计时器在200毫秒后停止时，请求发出。
When that timer goes off after 200 milliseconds, the request is made.
计时：即时技术”强调未来将属于用毫秒甚至微秒计算响应时间的人，而不是仍然使用秒，小时，甚至天的人”。
Time : Real time “emphasizes just how much the future will belong to those who measure response time in milliseconds, or even microseconds, rather than seconds, hours, or days.”
tcp _ fasttimo：每200毫秒调用它一次，并实现了快速计时器。
Tcp_fasttimo: It's invoked every 200ms and implements the fast timer.
tcp_slowtimo：每500毫秒调用它一次，并实现了慢速计时器。
Tcp_slowtimo: It's invoked every 500ms and implements the slow timer.
libevent计时器使用timeval结构，允许按秒和毫秒指定计时器。
The libevent timer USES the timeval structure, which allows timers to be specified in both seconds and microseconds.
属性，该属性指定一个计时器事件与下一个计时器事件之间间隔的毫秒数。
Property that specifies the number of milliseconds that pass between one timer event and the next.
介绍了脉冲星的时间频率特征。阐述了该课题研究的意义，国内外毫秒脉冲星计时理论方法和技术方面的研究进展。
We describe the characteristic of time and physics of pulsars, and the significance of study, as well as recent progress in techniques of millisecond pulsar timing study.
缺省时间切片是10毫秒(一个时钟计时单元)。
缺省时间切片是10毫秒(一个时钟计时单元)。
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