假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的作文。文章中共有10处语言错误，每句中最多有两处。 错误涉及一个单词的增加，删除或修改。

增加： 在缺词出加一个漏字符号(^)。并在其下面写出该加的词。

删除： 把多余的词用斜线（/）划掉。

修改： 在错的词下划一横线，并在该词下面写出修改后的词。

注意：1， 每处错误及其修改均仅限一词。

2， 只允许修改10 处， 多者 （从第11 处起）不计分。

All parents wish their children, especially junior high students, can go to top university and have a  bright  future. So they always expects their children to make fully use of their time to study . They don’t allow them watching TV ,play the computer games or go out to play with their friends . Some students just complained that their parents are only concerned about their grades and not their other needs.

In my opinion ,how our parents are doing is out of nothing but love. The most important thing , I think, is that they should learn to communicate with our parents, tell them that we’ll never let them down and will work harder  earn trust and respect from them.

简述安防系统组成并列举其各子系统组成？