puppy love
青春期的初恋，通常是不成熟且短暂的恋爱
口语·形容青涩恋情
英文释义
to describe the intense but shallow romantic feelings that often occur between young people
例句
Their romance is just puppy love; it probably won't last through summer.
典故来源
比喻像小狗般热情但短暂的依恋，常见于青少年初恋。