This school bag is four times heavier than that one.

这个书包是那个书包的四倍重。

Don't pack your school bag!

不要塞满你的学校袋！

My book is in the school bag.

我的书在我的书包里面。

Pencil case, glue, school bag.

铅笔盒，胶水，书包。

Perhaps it's in your school bag.

它可能在你的书包里。