In this example, if the Map on line 1 does not contain the person named "Bob," a null pointer exception will result on line 5 when the person is asked for his name.
在这个例子中，如果第1行的Map不包括一个名为“bob”的人，那么在第5行询问person的名字时就会出现null指针异常。
This function calculates the difference between two jiffies values, and then provides the result to the user through a user-space pointer.
这个函数会计算这两个jiffies值之间的差值，然后通过一个用户空间指针将结果提供给用户。
The fetch function sets the result set pointer to the next row.
fetch函数将结果集指针指向下一行。
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