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，详情可参考heLLoword翻译官方下载
Victoria Tamlyn, in her "mid-50s", was introduced to Cruz's music on YouTube. "It's really good. But I'm a big Beckham fan anyway," she laughs.。同城约会是该领域的重要参考
优点：计算简单，导数恒为1（正区间），缓解梯度消失