loop语句不限次数地执行一个语句块。
The LOOP statement executes a statement block for an unspecified number of iterations.
full_scans文件表明已经执行的全区域扫描的次数。
The full_scans file indicates the number of full area scans that have been performed.
for 循环，它对一个语句块执行一定次数。
The for loop, which executes a block of statements a certain number of times
如果我们只执行一次数据抽取，我们现在已经完成了。
If we were only performing the data extraction once, we would now be done.
如果我们只执行一次数据抽取，我们现在已经完成了。
If we were only performing the data extraction once, we would now be done.
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