An entomologist collects the material that a kind of your pest is fed up with from inside bitter chinaberry, lay its Yu Tian head, pest Wen Jiwei does not eat vegetable.

• 一位昆虫学家从苦楝树中提取一种令害虫讨厌的物质，将其放置于田头，害虫闻其味就不吃蔬菜。