优点：计算简单，导数恒为1（正区间），缓解梯度消失
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const cur = val; // 简化变量名，代表当前价格，这一点在91视频中也有详细论述
Dr Tim Pestell, a senior curator of archaeology for Norfolk Museums Service, said: "This find is a powerful reminder of Norfolk's Iron Age past which, through the story of Boudica and the Iceni people, still retains its capacity to fascinate the British public.