This article originally appeared on Engadget at https://www.engadget.com/science/space/new-webb-telescope-photos-show-off-the-exposed-cranium-nebula-235609619.html?src=rss
* 时间复杂度：O(n log n)（主要来自排序），空间复杂度：O(n)
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But e-bikes containing lithium-ion batteries are a newer challenge. "When a battery fails, it doesn't necessarily ignite, it will often produce some off-gases," says Stephen Welch, senior lecturer at the University of Edinburgh's Fire Research Centre. "Those off-gases are toxic and flammable. If they accumulate, you can have an explosion risk."