Another way to approach the linear combination is to look at it geometrically. This is where the idea of barycentric coordinates can help. A barycentric coordinate system describes the location of a point as the weighted sum of the regular coordinates of the vertices forming a simplex. In other words, it describes a linear combination with respect to a set of points, where in -dimensional space.
这间夜总会的装潢风格仍停留在20世纪90年代。天花板用几十块薄板拼成，镶嵌着几百盏星星状的小灯泡，从黑洞洞的头顶发出扑闪扑闪的微弱光亮。这片并不华丽的“星光顶”是前两年才装的，加上其他设备耗资共两百多万。
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Collins had to pilot the shuttle through a 360 degree flip while flying beneath the International Space Station. It allowed colleagues on the orbiting lab to photograph the craft's underside and check if the heatshield had been breached.
Simply long-press the power button and ask Gemini to help book you a ride home or reorder your last meal. Gemini… https://t.co/GjfXTnGg0k pic.twitter.com/YGIvqBkbu3
与其说张清森意识到了线上渠道的潜力，不如说传统渠道想要打进去太烧钱，他只能把线上渠道当重要战场。