4.dye-based
1.propelling pencil
2.mechanical pencil
3.automatic pencil
lead gauge 螺距规卷笔刀:
1.sharpener
teacher教师
sharpener卷笔刀
2.pencil sharpener
pencil box 铅笔盒
pencil sharpener 卷笔刀
a rubber 文具盒
a ruler 卷笔刀
a car 自行车教科书:
1.textbook
encyclopaedia,encyclopedia 百科全书
textbook 教科书
2.coursebook
courier 专递员,专递公司
coursebook 教科书3.schoolbook