First love is a kind of vaccination which saves a man from catching the complaint the second time.

First love is a kind of vaccination which saves a man from catching the complaint the second time.

初恋是一种疫苗，它能使一个人在第二次恋爱时免受疾病的困扰。

-- Honoré de Balzac 尊敬的巴尔扎克