优点：计算简单，导数恒为1（正区间），缓解梯度消失
The rocket rose 80 feet into the air and exploded. Had the chemicals been packed slightly differently, he would have been blown to pieces.
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据「21 世纪经济报道」，刘强东在现场指出，自己的精力仍将主要放在京东集团。但同时他也针对 50 亿的总投资额做出回应，「这样才能够去跟欧美全球顶级的游艇制造公司竞争。」