这个版本的注释较少，但是那主要是因为ebnf语法的自我描述能力很强。
This version has fewer comments, but that is mostly because the EBNF grammar is fairly self-documenting.
他沉迷于自我完善，整日整夜地研究欧几里德和语法学。
He engaged in feverish bouts of self-improvement, studying Euclid and grammar at all hours.
书中还附有10套HSK语法考试的模拟题，便于学习者自我检测。
The book also includes 10 sets of simulated HSK grammar tests for the learners to record their improvement.
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