优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
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食物價格飆升，越來越多伊朗人表示餐桌上紅肉消失，改以雞肉、起司或豆類等較便宜選項替代。
Since Donald Trump entered the White House for the second time, the U.S. import taxes faced by Morph, which supplies Walmart and Target, have lurched wildly—from zero tariffs to 20% tariffs to 50% tariffs, before briefly flirting with 145% tariffs. The figure fell back to 20%, before the Supreme Court intervention last week ruled the tariffs illegal, which brought them back down to zero. The president then announced a new 10% tariff, although there is some confusion about whether he actually means 15%.
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