Mold is usually green, white, black or gray.
霉菌通常为绿色、白色、黑色或灰色。
Potassium feldspar is usually red meat, but there was purple, white, gray, or black.
钾长石通常是肉红色的，但也有呈紫红色、白色、灰白色，甚至灰黑色。
The two-way data is usually necessary for the quantitative analysis of the gray system.
未知背景的灰色体系的定量分析通常需要二维数据。
The two-way data is usually necessary for the quantitative analysis of the gray system.
未知背景的灰色体系的定量分析通常需要二维数据。
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