He had turned a dark shade of pink and had slid under his chair in apparent shame.

他的脸变成暗粉红色，因为明显的羞愧而滑下他的椅子。

Fixed-mirror systems have drawbacks, however, they cannot track the sun to optimize performance and sometimes distracting patterns of lines of bright light and dark shade are formed.

固定反射镜系统存在缺陷，它不能循导太阳光以使其得到充分利用，并且有时会转移亮光的路线并产生阴影。