地理漫步·世界地理英语30篇（8）
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Spatial Gradients Reveal Earth’s Natural Transitions
空间梯度揭示地球的自然过渡带
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Temperature drops steadily as you climb a mountain.随着海拔升高，气温持续下降。
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Salinity rises gradually from river mouth to open ocean.从河口到开阔海洋，盐度逐渐上升。
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Tree height decreases smoothly across alpine elevation zones.在高山垂直带中，树高平缓降低。
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Soil depth changes slowly from hilltop to valley floor.从山顶到谷底，土壤深度缓慢变化。
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Grassland species mix at edges where forests end.森林边缘与草原交界处，草本植物种类混杂。
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Coastal cliffs erode at different rates along one shoreline.同一海岸线上，海蚀崖的侵蚀速率各不相同。
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These gradients show how geography blends, not divides.这些梯度体现地理要素的融合，而非分割。
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They help scientists classify regions by degree, not edge.它们帮助科学家按程度而非边界划分区域。