后来在院子中间还长出一棵桑树，那桑果,就是桑葚，慢慢地由绿变红，再由红变黑，就算熟透了。
B-Time I-Time O B-Location I-Location I-Location I-Location O O O O O B-Thing I-Thing O O B-Thing I-Thing I-Thing O O B-Thing I-Thing O O O O O O O O O O O O O O O O O O O O O