NSMutableData *data = [NSMutableData dataWithLength:arr.size];
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，这一点在safew官方版本下载中也有详细论述
Елизавета Городищева (Редактор отдела «Экономика»)，详情可参考旺商聊官方下载
TDT (Token-and-Duration Transducer):，这一点在51吃瓜中也有详细论述