优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
Notice how the highlighted region shrinks at each step. The algorithm never examines points outside the narrowing window. In a balanced tree with nnn points, this takes about log4(n)\log_4(n)log4(n) steps. For a million points, that's roughly 10 steps instead of a million comparisons.
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追逐它，不要放手。去做那件颠覆的事，那件掀翻现状的事，那件不仅挑战现状，而是重塑它的事。你可以做到。
"We have soft robots powered by air that can walk on land and then walk into water – we don't have to worry about what happens when things get wet," he explains. In one case, a six-legged robot devoid of electronics moves its legs to walk when air is pumped in and out of a tube.
舉例來說，汽車產業一直是中德關係的核心支柱，貢獻德國對中國出口的近三分之一。但近年中國汽車業崛起，根據榮鼎集團數據，2025年德國汽車對華出口暴跌66%至2009年最低，中國電動車品牌如比亞迪、蔚來在歐洲市場份額則從2020年的不足1%躍升至2025年的12%。