middle school是什么意思

双语用例

• Trajectories of physical aggression from toddlerhood to middle school.

• Approximately 24% of the sample reported receiving free lunch at school at the beginning of middle school.

• Contributions of genes and environments to stability and change in externalizing and internalizing problems during elementary and middle school.

• Students' perceptions of teacher support and general self-esteem declined and depressive symptoms increased over the course of middle school.

• Educational attainment was predominantly at the primary and middle school level.

• This was accomplished by surveying over 2000 middle school, high school, and college (science and non-science majors) students.

• Many of the changes associated with the transition to middle school are at odds with the developmental needs of adolescents.

• Designing a consistent curriculum that will flow smoothly through primary, middle school and high school will take years to implement.