When a for statement is executed, a cursor is implicitly declared such that for each iteration of the for loop, the next row is the result set if fetched.
在执行for语句时，游标被隐式声明，这样对于FOR循环的每一次迭代，取回的下一行就是结果集。
Finally, we make the starting offset for the next loop the ending offset of the current one.
最后，我们将当前的结束偏移量设置为下一个循环的开始偏移量。
The next for loop processes just the HTTP links only.
接下来将只对 HTTP 链接进行循环处理。
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