A useful feature to add to your applications is the capability to expand or collapse all top-level tree items.
可以向应用程序中添加一个有用的特性，那就是展开或折叠所有顶级树项目的功能。
The first step is to add the two buttons (lines 28 to 38 in listing 5) that expand or collapse all the tree’s items.
第一步是添加两个按钮（清单5中的第 28- 38行），用于展开或折叠树的所有项目。
A typical core does not collapse all the way down to a single star.
一般的云核并不会直接一路塌缩成单一恒星。
Should I err on the side of accuracy as it is now, or collapse all whitespace?
我是该精确地显示出每个空白字符呢，还是该将其全部压缩？
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