middle school的音标？

They recall the good buddies they used to have in middle school.他们想起了过去上中学时的好伙伴。He was a middle school student at the age of 14.他14岁时是个中学生.He was not good at algebra in middle school.他中学时不擅长代数....

n.中等学校，中学...

middle school的复数形式为：middle schools...