用产品经理的心态对待咖啡，不断迭代好喝的咖啡。公众号：咖啡平方
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Jim Lovell had been to the Moon twice, witnessed Earthrise and narrowly avoided a cold death in space - and saw no reason to falsely burnish his résumé.
Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00560-6
优点：计算简单，导数恒为1（正区间），缓解梯度消失