释义 n.二氟二氯甲烷；卤代烷哈龙（灭火剂）；卤化烃 实用短语halon extinguisher卤代烷灭火器,哈龙灭火器halon suppressant卤代烷抑爆剂halon fire extinguisher卤代烷灭火器,卤化物灭火器halon extinguishing agent卤代烧灭火剂halon bank哈龙银行halon horn卤代烷报警器halon extinguishing system卤代烷灭火系统halon recovery哈龙回收recycled halon回收的哈龙