Imagine a shiny new empty box, and picture yourself writing the word "Favorites" on it.
想象”出“一个新的空盒子，然后，想象一下你在盒子上面写下来”最喜欢事物“字样。
What we obtain is that searching with single word (single term) is an empty set.
我们得到的是单个词的搜索（单项）是空集。
What we obtain is that searching with single word (single term) is an empty set.
我们得到的是单个词的搜索（单项）是空集。
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