Why might the author have chosen that color, sound or physical description?
作者为什么选择这些来进行描写？
A physical description of the material, including its color and physical form.
物理性质的描述，包括颜色和物理形态。
There is no physical evidence or accurate description on record.
没有物证或者记录下来的准确描述来证明这些理论。
Description and various physical set ups where they occur: traffic flow, shallow water.
描述和相关各种物理现象的提出及产生环境：交通流量，浅水流动。
Description and various physical set ups where they occur: traffic flow, shallow water.
描述和相关各种物理现象的提出及产生环境：交通流量，浅水流动。
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