叶青超，尤联元，许炯心，等。黄河下游地上河发展趋势与环境后效。郑州：黄河水利出版社，1997。
Ye qingchao you lianyuan xu tongxin et al. development tendency and environmental aftereffect. Zhengzhou: yellow river conservancy press 1997.
那少年吃了一惊，急忙缩手时，只见缠在腕上的竟是一条尺许长的赤练蛇，青红斑斓，甚是可怖。
It was a colorful horrific small snake about one inch, the youth found when startle to withdraw his hand.
那少年吃了一惊，急忙缩手时，只见缠在腕上的竟是一条尺许长的赤练蛇，青红斑斓，甚是可怖。
It was a colorful horrific small snake about one inch, the youth found when startle to withdraw his hand.
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