schoolboy
noun [ C ] uk/ˈskuːl.bɔɪ/ us/ˈskuːl.bɔɪ/
（中小学）男生
a boy who goes to school
Idiom
as every schoolboy/schoolchild knowsidiom 小学生的常识
used before you mention a fact that is familiar to everyone, including children
As every schoolboy knows, the earth revolves around the sun. 地球绕着太阳转，这是小学生的常识。
schoolboy
adjective [ before noun ] uk/ˈskuːl.bɔɪ/ us/ˈskuːl.bɔɪ/
幼稚的
like a child or at the time when someone was a child
He recalled that he had a schoolboy crush on her (= liked her very much when he was a schoolboy). 他记得年少时曾经对她心动。