英语中年级grade有个 jk-8jk什么意思grade 是标题 下面就有个 jk-8 jk-77-8 应该就是7、8年

junior kindergarten
In Ontario there are two grades of kindergarten:junior kindergarten and senior kindergarten (referred to as JK and SK)。
In the United States kindergartens are usually part of the K-12 educational system。Children usually attend kindergarten around age 5 or 6。Kindergarten is considered the first year of formal education,although the child may have gone to preschool