To protect your eyes, you should do the following: first, when reading and writing, your posture should be correct; Second, after reading and writing for a certain period of time, look far away for a while; Third, do eye exercises seriously.

Source: New Language Learning (lower primary school edition) No.06, 2002 Author: Chen Yuping;

Punctuation mark after ordinal number

Some students often don't know what symbols should be added after words indicating ordinal numbers such as "first", "first" and "L", and even some newspapers and magazines often make mistakes. The correct usage should be as follows: _ When the order is indicated by "-"and "two", a pause is added after it. For example, "First, all actions are at your command." 2. When using lowercase numbers such as "L", "2" and "3" to indicate the order, add some dots at the back. For example, "L. Think in class." 3. Add a comma after the words indicating order such as "first", "second" and "third". For example, "First, peanuts are ugly." Fourth, when parentheses are used to indicate ordinal numbers, there is no need to add any symbols after them. For example, "(1) read the executive summary, preface, chapter table of contents, etc. Read every book quickly from beginning to end. " (5) Continue to master the correct reading and writing posture and develop habits. "Lei classmate, you understand Liao Hai, don't use it wrong next time. Punctuation marks after ordinal numbers in N nursery @ Chen Yuping Some students often don't know what symbols should be added after the words "first", "one" and "1", and even some newspapers and magazines often make mistakes. (