好处：你可以不必保存一盒盒过时的卡片，然后再将它们丢掉。
Bonus: you avoid storing, and then throwing away, boxes of outdated rack CARDS later.
如果您在编写一个只使用一次就丢掉的类——比如测试一个API的类——则无需将它放到包中。
If you're just writing a single class to test your intuition about an API and you will throw it away immediately after running it once, then you don't have to put it in a package.
这个大葫芦看来对我是毫无益处，因此我就将它打破丢掉了。
The big gourd is totally useless to me. Therefore I broke it and threw it away.
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