Assuming your timer Interval property is set to 1000 milliseconds, you may be surprised to find out that the first message box that pops up will show a value of 5.
假设你的定时器间隔属性设置为1000毫秒，你也许会奇怪当第一个信息框弹出时显示的值是5。
The interval may be assumed to have been a major formative period in his life: he was 21 years old when it began, 31 when it concluded.
但是这段时间可以被认为是一个人的成形时间(formative period)：开始于他21岁，终止于他31岁那年。
Then write some for an interval of size 2. It may need a comparison. It will still be simple.
然后再写一些大小为2的间隔。它可能需要一个比较。它仍然是简单的。
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