Lambs go up the hill with offset paper. Offset paper, formerly known as "Dowling Paper", is mainly used for printing high-grade color printed matter by lithographic (offset) printing machines or other printing machines, and is suitable for printing monochrome or multicolor book covers, characters, inserts, pictorial, maps, posters, color trademarks and various packaging products.

The Chinese graded reader of Children with Lambs on the Mountain is an original Chinese graded reader series written by Sun Bei, a leading Chinese graded reader, in conjunction with American first-line education experts, mature picture book authors and illustrators, for children aged 4-9 who are in the sensitive period of literacy and reading.