云雀在鸣叫，白鸽群在天空中飞翔，燕子无声地翻飞在林间，山羊在草地上游走，嚼着草叶。
B-Thing I-Thing O O O O B-Thing I-Thing O O B-Location I-Location I-Location O O O B-Thing I-Thing O O O O O O B-Location I-Location O B-Thing I-Thing O B-Location I-Location I-Location O O O O O B-Thing I-Thing O