在Leopard系统中，相对应的按钮是左上角的绿色圆圈；点击这个按钮可以将小窗口放大到根据内容优化的最佳尺寸，但不一定是全屏。

In Leopard, the equivalent button — a green circle at the upper left — increases a small window's size to a footprint deemed optimal for its contents, which isn't always the whole screen.

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它们通常不断跟踪指针的移动和输入焦点的改变，然后相应地调整放大的窗口。

They generally keep track of pointer movements and changes in input focus and adjust the enlarged view accordingly.

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放大倍数根据窗口的高度确定。

That magnification is based on the height of the window.

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There's a whole bunch of blocks that we'll look at in more fun detail on Friday but I'm going to pick the easiest one here and I'm going to type Hello CS50 in this string, "Hello CS50", zooming in say how nice the puzzle pieces are nicely interlocked?

今天我们看到的各种图块,到下周五我会仔细讲解其中的精妙之处,但今天我只想举一个最简单的例子,我要在这儿键入字符串，放大窗口，然后看看这漂亮的图形和文字,是如何美妙地连结在一起的？

哈佛公开课 - 计算机科学课程节选