研究人员发现，感染病毒的植物能够发出一种气体；这种气体能在临近植物中激发疾病抗体。
Researchers discovered that plants infected with a virus give off a gas that activates disease resistance in neighboring plants.
有一种假说认为，徳干火山喷发出的大量二氧化硫有毒气体进入了大气。
One theory suggests the Deccan lavas spewed immense amounts of poisonous sulfur dioxide gas into the atmosphere.
这种气体发出一种难闻的气味。
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