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(with redundant anchors) also an email address (somewhat more strict)。体育直播对此有专业解读
if response.status_code == 200:，详情可参考51吃瓜
DSD 文件也不能简单的靠 PCM 数据中的声音的频率界限来判断真假；但我相信一定有其他方法能够分析处 DSD 中特有的能量分布，等我找到这个方案后再来更新。
Less than: Every domino half in this space must add up to less than the number.