Many parents send their children to pre-schools to develop social skills during early education.

pre-schools 是由前缀 pre-（表示“在...之前”）和名词 school（学校）组成的复合名词，指“学前学校”，也就是“幼儿园”。pre-schools 是 pre-school 的复数形式，强调这类教育机构的普遍性。