Asfruitneedsnotonlysunshinebutcoldnightsandchillingshowerstoripenit,socharacterneedsnotonlyjoybuttrialanddifficultytomellowit(HughBlack,Americanwriter水果不仅需要阳光，也需要凉夜。寒冷的雨水能使其成熟。人的性格陶冶不仅需要欢乐，也需要考验和困难。(美国作家布莱克H