老专家熟悉的是过去的规律。但如果规律本身在改变，熟悉过去反而会成为理解未来的障碍。
“德国汽车在华销量疲软是战略失误。”
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В Иране заявили о ракетном ударе по разбившемуся американскому самолету02:12
To rigorously define inverse hyperbolic cosine, we need to make a branch cut. We cannot define arccosh as an analytic function over the entire complex plane. But if we remove (−∞, 1], we can. We define arccosh(x) for real x 1 to be the positive real number y such that cosh(y) = x, and define it for the rest of the complex plane (with our branch cut (−∞, 1] removed) by analytic continuation.
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Фото: Iryna Rybakova / Press Service of the 93rd Kholodnyi Yar Separate Mechanized Brigade of the Ukrainian Armed Forces / Handout / Reuters，推荐阅读官网获取更多信息
Семен Александров (старший редактор отдела Мир)