preschool

詳細解釋：

pre.school

adj.（形容詞）
Of, relating to, intended for, or being the early years of childhood that precede the beginning of elementary school.
學齡前的，入學前的：在國小教育開始之前即兒童時代早期的，與這有關的或為此服務的
n.（名詞）

A school for children who are not old enough to attend kindergarten; a nursery school.
保育園：為年齡未夠上幼稚園的兒童服務的學校；託兒所