Physically separating the weed from the other plants, the researchers placed the dodder seedling in the middle of two plastic pipes, each leading to a plastic box containing a plant.

• 研究人员将菟丝子秧苗放到两个塑料圆筒中间，两个圆筒分别通向一个塑料盒子，盒子里各放着一种植物。