The Number property indicates the physical slot number, which can be used as an index into a system slot table, whether or not that slot is physically occupied.
因此，可以用相对记录号加上文件起始地址的方法算出任意一个记录的物理位置。（记住：文件的起始地址是当文件被打开时，从磁盘的索引中得到了）。
This tells us the row that we are interested in is on page 0 of the table, in slot 10.
它告诉我们所关注的这一行是在表的第0页的slot 10中。
Then the second table is scanned, only once, the function directs us to the proper slot in the hash table and from there you find the pointers to the matching rows.
然后，第二个表被扫描，只扫描一次，那个函数引导我们到哈希表中适合的位置，并且从那里，你找到匹配的行指针。
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