名词
中文翻译：渐变带
同义词：
['transition zone', 'transitional zone']
例句：
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1.The scientist discovered a gradation zone between two different species of plants.
科学家发现了两种不同植物之间的一个渐变带。
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2. The engineer designed a gradation zone to separate the two materials during the assembly process.
工程师设计了一个渐变带，以在组装过程中分离两种材料。
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3. The gradation zone was used to control the flow of water through the river.
渐变带被用来控制河水的流动。