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Requires that iPhone, with an active carrier plan, and Mac are signed in with the same Apple Account, iPhone and Mac are near each other, signed in to FaceTime with the same Apple Account, have Wi-Fi turned on, and are connected to the same network.
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总体来看，线上线下联动、流量与福利结合的营销方式，是蚂蚁阿福抢占用户心智的“助推器”。当然，这背后还有一个必要前提——国内医疗需求十分庞大。
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The N-closest or N-best dithering algorithm is a straightforward solution to the N-candidate problem. As the name suggests, the set of candidates is given by the closest palette colours to the input pixel. To determine their weights, we simply take the inverse of the distance to the input pixel. This is essentially the inverse distance weighting (IDW) method for multivariate interpolation, also known as Shepard’s method. The following pseudocode sketches out a possible implementation: