* 核心功能：每次调用next(val)，返回当前价格的跨度（往回数≤当前价格的最大连续天数）
These color-changing sunglasses are like something out of a sci-fi movie
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Getting children to play together cooperatively depends less on their personal social skills and more on what they are doing – especially if they are not friends – a study shows.
“In order to be successful, you need to make sure that your gross margin is right and your profit margin is right,” he says of navigating those cost shocks.