”一个月过去了，一天，邮递员突然送来一个邮件要收件人签字，我接过一看，是大哥从西安给我寄来的。
O B-Time I-Time I-Time O O O O B-Time I-Time O B-Person I-Person I-Person B-Time I-Time O O B-Metric I-Metric B-Thing I-Thing O B-Person I-Person I-Person B-Thing I-Thing O B-Person O O O O O O B-Person I-Person O B-Location I-Location O B-Person O O O O