优点：计算简单，导数恒为1（正区间），缓解梯度消失
跨平台：iOS、Android、Web
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For this story, WIRED reviewed dozens of NASA documents, including backup plans and contingencies for emergencies, and spoke to more than a dozen people, including three astronauts who’ve visited the ISS, and no one seemed that freaked out. One astronaut said the most worrisome scenario that actively crossed his mind in orbit was getting a toothache. The ISS has had some emergencies, including a first-ever medical evacuation in January, but generally things have been remarkably stable. In fact, one of the most impressive things about the ISS is that nothing very dramatic has ever happened to it. No experiment has gone too haywire. It hasn’t been hit by an asteroid.
Appendix I: Candidate Sorting
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If you like playing daily word games like Wordle, then Hurdle is a great game to add to your routine.
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