一枚银杏叶子悄无声息地飘落下来，嵌入何老太的银发里，何老太并无半点儿察觉。
B-Metric I-Metric B-Thing I-Thing I-Thing I-Thing O O O O O O O O O O O O B-Person I-Person I-Person O B-Location I-Location I-Location O B-Person I-Person I-Person O O O O O O O O