解析器是一种软件，它从文本获得那些 有意义的单词，并通过识别这些单词的类型与用途，从中构建解析树。

The parser is the software that takes those meaningful words and builds a parse tree out of them by recognizing their type and purpose.

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试验说明是：看着每个单词，努力将它形象化（看到”树“时，想像”树“），然后继续下一个单词。

The instructions said: Look at the word, try to visualize it (see "tree;" imagine "tree") and then go on to the next word.

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