room parent
noun [ C ] uk/ˈruːm ˌpeə.rənt/ us/ˈruːm ˌper.ənt/
（在美国，帮助老师和家长进行沟通的）家长代表，轮值家长
in the US, a parent who helps the teacher of a class in their child's school, and helps communicate between the school and other parents
Most teachers welcome room parents who provide academic assistance and help build a strong community. 大多数老师都欢迎家长代表在学习方面提供协助，并帮助建立起沟通密切的交流群。