2 年 - 翻訳

https://bksfe.com/read-blog/9_....do-you-know-the-mean

Do you know the meaning of writing 2B, HB on a pencil?
bksfe.com

Do you know the meaning of writing 2B, HB on a pencil?

Today's topic is about the 2B,HB etc written on the pencil. There is hardly anyone who has not used a pencil. Our education starts from childhood