寒气笼罩着湖面，太阳消失了，阴影悄悄掠过水面，水变冷了。
Little shivers ran over it, and the sun went away and shadows stole across the water, turning it cold.
绘画一幅研究范围的简图，图中包括水流方向、露出水面的石块、阴影盖着研究范围的树木及其它可能有关的资料。
Draw a sketch map of the area in which you have worked. Indicate flow direction, breadth, exposed rocks and positions of the trees which are related to the ecosystem.
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