大小单双公式规律简介：Well, okay, the speed of light is still faster than the speed of sound. Su Can looked around and found that very few people in the class were actually paying attention. Even Cheng Keshu was frowning slightly while taking notes.
Well, okay, the speed of light is still faster than the speed of sound. Su Can looked around and found that very few people in the class were actually paying attention. Even Cheng Keshu was frowning slightly while taking notes.
