Belong to. Because the smell is heavy, similar to the smell of gas. In addition, durian shells are dangerous with thorns, which refer to substances with anesthetic, toxic or other similar properties, which can cause emotional irritability or discomfort of aircraft crew, thus affecting the correct execution of flight tasks and endangering flight safety. Such as fruit durian and garlic oil. Miscellaneous dangerous substances refer to the ninth category of dangerous goods in the International Rules for the Carriage of Dangerous Goods by Sea.