近几年我国的蔬菜出口业之所以经常遭遇国外的“绿色壁垒”，与菜农使用农药不当、造成蔬菜中农药成分超标有关。其实使用有害的化学合成农药并非惟一的选择。目前，利用天然香精油作为新型无公害“农药”已成为一种国际新趋势。科学家早已知道，植物在其长期进化过程中会在体 In recent years, the reason why China’s vegetable export industry frequently encounters foreign “green barriers” is improper use of pesticides by vegetable farmers, resulting in excessive content of pesticides in vegetables. In fact, the use of harmful chemical synthetic pesticides is not the only choice. At present, the use of natural essential oils as a new pollution-free “pesticide” has become a new international trend. Scientists have long known that plants will be in their body during their long-term evolution