Hundreds gathered in Manger Square to bask in the festivities that included music, dancing and Santas bearing sweet treats.
xpath: Avoid uninitialized pointer without context node，这一点在safew官方版本下载中也有详细论述
。safew官方下载对此有专业解读
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Dithering in its simplest form can be understood by observing what happens when we quantise an image with and without modifying the source by random perturbation. In the examples below, a gradient of 256 grey levels is quantised to just black and white. Note how the dithered gradient is able to simulate a smooth transition from start to end.