Excellent writing property: the colored coating is suitable for pencils, pens and other writing instruments, easy to write and suitable for various automatic coding machines.

优异的书写性：彩色涂层适合铅笔、钢笔等各种书写工具轻松书写，适台各种类型的自动打码机。

youdao

Either they note the context of the preceding sentences or they infer the meaning in isolation by knowing certain rules about the real world in this case, that boxes are bigger than pens (writing instruments) but smaller than pens (playpens), and that bigger objects cannot fit inside smaller ones.

ECONOMIST: A gift of tongues

Work on this "prototype" allowed him to figure out technique, layout and technical details like the type of paper (19-by-13-inch watercolor) and writing instruments (felt-tip pens).

WSJ: Unlikely NY scribe handwrites Good Book in 4 years