自1998年中期开始，从湖南老家的来信就渐渐减少。虽然憋着一口气，常常有意想忘却培养我20多年的母校，然而，人的记忆岂能由人想要就要、想丢就能丢得了？今天收到“有关杨德森教授70寿辰活动的通知”，思师的面容立刻浮现在我的眼前。光阴荏苒，日月如梭，转眼间恩师杨德森 Since mid-1998, letters from their hometown in Hunan have been gradually reduced. Although simmering, often deliberately forgotten to cultivate my alma mater for more than 20 years, however, the human memory can not be what we want, lost can lose it? Today received “notice of Professor Yang Desen’s 70th birthday activity,” the thinking of the teacher’s face immediately emerge in front of me. Time flies, the sun and the moon as the shuttle, an instant mentor Yang Desen