如果用户经常要等待1秒钟以上，就认为服务器过于繁忙。
If users often experience response times of more than one second, the server is generally considered to be too busy.
绝对不要让顾客等待10秒钟以上——或者，最起码让他知道你何时有空提供协助。
Never let a customer wait for more than 10 seconds-or, at the very least, let her know when you'll be available.
跑上山时的步子要保持不变，大约在45秒钟以上，然后再慢跑下山，这样重复跑四次以上。
Run up at a constant pace for up to 45 seconds, then jog back down and repeat four more times.
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