準(zhǔn)備開(kāi)始翻譯Antlr的文檔，已經(jīng)取得了Antlr的作者Terence Parr的授權(quán)，將會(huì)做為Antlr的中文官方文檔發(fā)布。
有興趣一起翻譯的請(qǐng)和我聯(lián)系，目前Long、阿樂(lè)等人已經(jīng)加入。有意加入的請(qǐng)首先完成下面的幾個(gè)問(wèn)題，然后Email給我（about521 at 163.com），并告知您的聯(lián)系方式等信息：
1、請(qǐng)翻譯下面的段落：
A lexer (often called a scanner) breaks up an input stream of characters into vocabulary symbols for a parser, which applies a grammatical structure to that symbol stream. Because ANTLR employs the same recognition mechanism for lexing, parsing, and tree parsing, ANTLR-generated lexers are much stronger than DFA-based lexers such as those generated by DLG (from PCCTS 1.33) and lex.
2、編譯器的六個(gè)階段：_____、_____、語(yǔ)義分析、中間代碼生成、代碼優(yōu)化和代碼生成。
3、(1+2)*3的抽象語(yǔ)法樹(shù)是什么樣的？