北京难得下场雪。王礼先教授难得有一天休息。窗外雪花像一条条银线从天的那一头无声地飘了下来，王教授默默地写着一篇新的论文。身旁是一个个书柜，里面静静地伫立着他的一部部力作。他刚刚又获得了一个奖励。他负责的“高等农林院校环境生态类本科人才培养方案及教学内容和? Beijing rare snow. Professor Wang Lixian rarely rest one day. Snow out the window like a strip of silver line from the sky silently drifted down, Professor Wang silently wrote a new essay. Beside them is a bookcase, quietly standing with his masterpiece. He has just won another award. He is responsible for "higher agriculture and forestry colleges and universities environment and ecology undergraduate talent training programs and teaching content and?