1. 选基准：随机选一个元素作为基准(pivot)
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The images of the Exposed Cranium Nebula suggest multiple episodes of stellar outbursts. A dark lane runs straight through the middle, splitting the glowing cloud into two hemispheres, reinforcing its brainy likeness.
Josh Feldberg, who lives in London, started using Reddit about 14 years ago. "I started using it because I have ADHD - I didn't get a proper diagnosis for years - and then a friend said they sometimes share resources on there."