退休老人夏天在树荫下，春秋在房山头几个老伙伴闲谈打发一天的时间。
B-Person I-Person I-Person I-Person B-Time I-Time B-Location I-Location I-Location I-Location O B-Time I-Time O B-Location I-Location I-Location B-Metric I-Metric B-Person I-Person I-Person O O O O O O O B-Thing I-Thing O