But some of the monarchs were sick, and what I found is that some of these milkweeds are medicinal, meaning they reduce the disease symptoms in the monarch butterflies, meaning these monarchs can live longer when they are infected when feeding on these medicinal plants.
某些斑蝶则生着病， 我发现某些乳草有药效， 有效减低帝王斑蝶的症状 只要它们食用这些药草， 就可以延长自己的性命。