摘要：
Color is the perceptual characteristic of light described by a color name. Specifically, color is light, and light is composed of many colors—those we see are the colors of the visual spectrum: red, orange, yellow, green, blue, and violet. Objects absorb certain wavelengths and reflect others back t 阅读全文
摘要：
Robots press the social buttons. I love these words.http://v.youku.com/v_show/id_XMzAzNDkzMTgw.html 阅读全文