Other unpleasant changes may include odor production or alternations in tactile characteristics.
另外还有使人感到不愉快的其它现象，诸如产生气味或是手感起变化等情况。
Tone refers to shading of light and dark on an object and texture is the visual and tactile surface characteristics of an object.
色调涉及到阴影以及物体颜色光亮程度；结构涉及到物体的外观特征。
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