Use SemanticDifferentialmethod (SD method) to analysis electric bicycle design characteristics, extract the modelling elements of electric bicycle's appereance.
应用意象尺度法（即SD法）对现有电动自行车造型特点进行了分析，提取了电动自行车的造型元素。
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Semanticdifferential (SD) method is a most commonly used method in subjective sound quality and sound perception assessment.