1. Computers do not know about letters, punctuation, or sentences. 计算机不懂得字母，标点还是句子。
2. I can use correct grammar, vocabulary, spelling, and punctuation when I write in English. 当我用英语写作时，能够使用正确的语法、单词、拼写及标点符号。
3. Comma usage is one of the most complex, most misunderstood, questions of proper punctuation. 逗号的用法是正确运用标点过程中最，最产生误解的问题之一。
英英解释
n.
1. something that makes repeated and regular interruptions or divisions
2. the marks used to clarify meaning by indicating separation of words into sentences and clauses and p
3. the use of certain marks to clarify meaning of written material by grouping words grammatically into
