文章通过归因分类和例证分析了中国学生在英语写作中出现的四类标点符号错误：1）来自汉语负迁移的英文标点符号错误；

Four types of punctuation errors are listed as follows: 1) errors caused by negative transfer from the native language;

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英文版本在拼写和标点符号上作了一定修改。

English text is edited for spelling and punctuation.

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通过键盘，可以将英文字母、数字、标点符号输入到计算机中，因而可以向计算机发出命令。

Through a keyboard, English letters, Numbers and punctuation can be inputted into the computer, so keyboards can say the words.

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