Give you universal knowledge:

It is difficult to estimate valuable securities and valuables that are easily lost, such as Bill of lading, check list, passport, quota card, license, license, private document, bill of exchange, invoice, domestic or foreign currency (cash), gold and silver ornaments, artificial jewellery, mobile phone.

Various dangerous products that are inflammable, explosive, corrosive, toxic, strong acid and alkali and radioactive, such as matches, detonators, gunpowder, firecrackers, gasoline, diesel, kerosene, alcohol (liquid and solid), sulfuric acid, hydrochloric acid, nitric acid, organic solvents, pesticides and other chemicals published by Chemical Industry Press. The chemical products in the handbook.

All kinds of strong poisons, narcotic drugs and mental substances, such as arsenic, opium, morphine, cocaine, heroin, hemp, etc.

The state law prohibits the circulation or shipment of articles, such as cultural relics, weapons, ammunition, and simulation weapons.

Newspaper books, pictures, publicity materials, audio and video products, laser discs (VCD, DVD, LD), computer disks and CDs, containing reactionary, obscene or dishonest content.

To obstruct public health, such as skeletons (including burned bones), animal skins not made of nitrate, and untreated animal bones.

Animals, plants, and their specimens.

A white powder that is difficult to identify.

Private letters and so on.