That means a fragrant plant, such as lavender, peppermint, or eucalyptus, has its aromatic compounds concentrated into a form which is then sold for use in oil burners and vaporisers.

这就意味着是把薰衣草、薄荷或桉树等香料植物的芳香化合物浓缩后出售，放在熏香器和香薰蒸发器中使用。