The original :

紙的發(fā)明對(duì)世界文化和國(guó)家交流是一個(gè)重大的貢獻(xiàn)。最早的漢字是刻在動(dòng)物的骨頭或?yàn)觚敋ど系?。?zhàn)國(guó)時(shí)期（the Warring States Period ）,文字開始被刻在竹簡(jiǎn)上（bamboo slips）上。然而，骨頭、竹片和木頭都非常重，不便于攜帶。到了西漢時(shí)期，當(dāng)時(shí)的貴族（noble caste）用的是絲綢或棉花做的薄紙。這種紙不僅便于書寫，還特別適合作畫。但是其造價(jià)太高，平民百姓根本承受不起。公元105年，東漢官員蔡倫在學(xué)習(xí)總結(jié)前任造紙方法的基礎(chǔ)上發(fā)明了一種新型的低成本植物纖維（fiber）紙。

Reference translation :

The invention of paper is a great contribution to the world's cultural development and international communication.The earliest Chinese characters were carved on animals bones or tortoise's shells.During the warring States Period, bamboo slips were used instead.However,bones ,bamboo slips ,wood were too heavy to carry.During the Western Han dynasty, the noble caste wrote on thin paper made from silk or cotton.It's easy to write and even excellent to paint on this kind of paper.However,it was so expensive that the civilians couldn't afford it.In 105 A.D. ,Cai Lun,a high-ranking official in the Eastern Han Dynasty ,learned from the old way of paper making AMD invented a new kind of cheap plant fiber paper.