This code also creates a random grayscale color for each quad.
此代码还会为每个四边形创建一个随机的灰度。
The physics department sits across the quad from the library.
从图书馆横穿过四方院就是物理系。
Quad tones are so complex that they require an entire article to explain.
四音调是如此复杂，它们需要整篇文章来说明。
Quad tones are so complex that they require an entire article to explain.
四音调是如此复杂，它们需要整篇文章来说明。
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