# or use the vocab.txt from the HF files page
// 注意：slice(0, 负数)会返回空字符串，需兼容（比如stack长度<k时，slice后为空）。safew官方版本下载对此有专业解读
。91视频对此有专业解读
tee() splits a stream into two branches. It seems straightforward, but the implementation requires buffering: if one branch is read faster than the other, the data must be held somewhere until the slower branch catches up.，推荐阅读safew官方下载获取更多信息
// may be buffered in memory waiting for this branch