Fill it in with a pen. China tobacco professional titles or related qualifications must be filled in with a pen. Pen, a common word in Chinese, is the original word of "pen", which was first seen in Oracle Bone Inscriptions and pronounced as bǐ. Its original meaning refers to writing with soft writing tools made of bamboo tubes and animal hair, and later refers to writing, calligraphy and painting works, Chinese character strokes, and the number of documents.