communications were widely used in the military during the second World War and
物理世界的重建，才刚刚开始。而与此同时，在离普通人最近的消费端，一场新的入口争夺战也正在悄悄打响。
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Uncertainty reigns
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.