我们紧张起来，是不是索道坏了?突然，看见索道车里玻璃上写着两快三慢，才招呼大家不紧张。
B-Person I-Person O O O O O O O O B-Thing I-Thing O O O O O O O O B-Location I-Location I-Location I-Location I-Location I-Location I-Location O O O O O O O O O O B-Person I-Person O O O O