设G为局部紧群，在一致连续函数空间U（ G）上，用两种方法证明左不变平均和拓扑左不变的等价性。
On uniformly continuous function space U(G), Equivalence of invariant mean and topological invariant mean is showed by two methods.
Win+Shift+左/右箭头 将当前程序窗口从一个显示器移到另一个显示器，保持相对显示器边缘位置不变。
Win+Shift+Left Arrow and Win+Shift+Right Arrow : Move a window from one monitor to another, keeping them in the same relative location to the monitor’s top-left origin.
左：机器人向左旋转90度，并保持原先所在的格网位置不变。
Left: the robot turns left 90 degrees and remains on the current grid point.
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