盘丝系腕,巧篆垂簪,玉隐绀纱睡觉。银瓶露井,彩囗云窗,往事少年依约。为当时曾写榴裙,伤心红绡褪萼。黍梦光阴,渐老汀洲烟箬。邓攸无子寻知命,潘岳悼亡犹费词。When the demand for something is greater than its supply, producers and suppliers will sense the possibility of making a profit - the excess of revenues over expenses is the profit. |