No design differences just a colour difference.
除了颜色外并没有其他设计上的差别。
First, it may be that their environment is causing the colour difference, a theory called the "exposure" hypothesis.
首先,“暴露”说认为颜色差异由环境因素引起。
The second member of each pair shall be such that the colour difference between it and the adjacent first member is as follows.
每一对中的第二件的应当是如此:它与相邻的第一件的颜色差为如下所示。
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