Note that the demand for trains is unlimited, so a very large value is the upper bound on line 43.
注意对于火车的需求是无限的，因此在43行上我们使用了一个很大的值作为上界。
In the above command a value of 0 is specified, which sets the number of requests allowed down a single socket to unlimited.
上面的命令中指定了值0，将允许通过单个套接字发送的请求数量设置为无限大。
O2, for most users, will provide the best value — with fewer hotspots but more genuinely unlimited Wi-Fi access to them.
对于大多数用户来说，O2能够提供最大的价值——虽然它提供的无线热点比较少，但是是更加名副其实的无限制无线上网。
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