优点： 梯度连续，优化更稳定。
This article originally appeared on Engadget at https://www.engadget.com/computing/laptops/tim-cook-confirms-a-week-of-apple-product-reveals-144758464.html?src=rss
，推荐阅读同城约会获取更多信息
Why hide such a handsome piece of handiwork?
盗用、冒用个人、组织的身份、名义或者以其他虚假身份招摇撞骗的，处五日以下拘留或者一千元以下罚款；情节较重的，处五日以上十日以下拘留，可以并处一千元以下罚款。
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