Eupatorium adenophorum, also known as vanilla and Brassica napus, is a perennial herb with tufted hairs, thin stems, golden yellow flowers, inverted oval leaves, round or spoon-shaped leaves and frost on the surface. It was first born in foreign countries, and was introduced to China in BC 138 when Zhang Qian went to the Western Regions. Cao Yun is mainly produced in Sichuan, Gansu, Shaanxi, Guizhou and Yunnan. It not only has a special fragrance, but also is a precious medicinal material. Most libraries at or above the provincial level still use Cao Yun to protect precious books and records. As a medicinal material, Cao Yun mainly supplies pharmaceutical factories. Cultural department procurement is mainly used to protect paper collections.

If cockroach eggs are found, you can also put cockroach killing tablets for poisoning. It is also important to open the window as much as possible to keep indoor ventilation in the weather without rain, and you can also use an electric fan to drive away the tide and cool down.