Because bound right inside the back of the book are crayons for doing the activities.

因为里面的书后面的约束的权利，是做活动的蜡笔。

youdao

Because bound right inside the back of the book are crayons for doing the activities.

因为里面的书后面的约束的权利，是做活动的蜡笔。

youdao