植物学课上，老师介绍说，箭毒木的乳汁含有强烈毒性，不能徒手接触。
In botany class, the teacher explained that the sap of the upas tree is highly poisonous and must not be touched with bare hands.
In botany class, the teacher explained that the sap of the upas tree is highly poisonous and must not be touched with bare hands.