school bag的意思是“书包”，其音标为：[ˈskuːlbæg]。用法如下：书包是学生们用来装书本和学习用品的一种袋子。

school bag的意思是书包，其释义为：学生用的书包、文件夹或公文包。在英文中，它通常被用来装书、笔记本、文具等学习用品。

school bag的用法：通常用作名词，表示学生用来装课本和文具的包包。

双语翻译：My school bag is very heavy. 我的书包很重。

常见用法：在描述书包的沉重时使用，也可以说“I need to go to the schoolbag store to buy a new one.”（我需要去书包店买一个新的书包。）

以上是对school bag的基本解释及其用法和例句，希望对你有所帮助。

school bag的意思是书包，其释义为：a large bag that a student carries to school to put their books and other belongings。

用法：直接作主语或作动词宾语使用。

双语翻译：英汉互译下，英语为“schoolbag”。

常见短语有：

1. put away one's school bag收拾书包

2. take one's school bag with one's school things随身带着学习用具上学

3. go to school with a school bag背着书包上学

4. carry one's school bag背起书包

5. put on one's school bag收拾起书包

6. take one's school bag with him/her and go to school带着书包上学

7. a big school bag一个很大的书包

8. a small school bag一个小的书包

9. a new school bag一个新书包

10. old school bag旧书包。