它们一簇簇、一片片散落在原野上，像天上的一朵朵白云。
B-Thing I-Thing B-Metric I-Metric I-Metric O B-Metric I-Metric I-Metric O O O B-Location I-Location I-Location O O B-Location I-Location O B-Metric I-Metric I-Metric B-Thing I-Thing O