During the last two decades, a serious cold summer disaster occurred every three or four years in Northeast China, which greatly reduced the grain production of the re gion. However, the cold weather in Northeast Chin...During the last two decades, a serious cold summer disaster occurred every three or four years in Northeast China, which greatly reduced the grain production of the re gion. However, the cold weather in Northeast China is not a local, temporary phenom-展开更多
文摘During the last two decades, a serious cold summer disaster occurred every three or four years in Northeast China, which greatly reduced the grain production of the re gion. However, the cold weather in Northeast China is not a local, temporary phenom-
