这取决于很多因素，但为了便于说明，我对蒙特利尔市做了一些估算。
That depends on many things, but for purposes of illustration, I have run some estimates for Montreal.
无论是最好方法或没有，这取决于很多因素，其中一些，你还不知道。
Whether it's the best approach or not, that depends on a lot of factors, some of them which you don't even know yet.
哪些线程阻止?这取决于一些随机因素，例如系统上的负载、等待计划程序的线程数等等。
Which threads resume and which threads block depends on random factors like the load on the system, the number of threads waiting for the scheduler, and so on.
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