preschool是什么意思？

Social scientists say the differences arise in part because low-income parents have less money to spend on music class or preschool, and less flexible schedules to take children to museums or attend school events.

Public policies aimed at young children have helped, including public preschool programs and reading initiatives.

Most affluent parents enroll their children in preschool or day care, while low-income parents are more likely to depend on family members.

The most common topics they discussed included kids' sleep, nutrition, discipline, behavior problems and day care and preschool.