名词卤素
1. Local residents add pickled foods and more than ten halogen seasonings to the eggs when cooking.
2. Halon is a compound in which the hydrogen atoms of a hydrocarbon have been replaced by bromine and other halogen atoms.
noun
1. halogen什么意思
1. any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions