春天的清晨，我若进的了公园，我必防看着梯级和林间的坡路窄道不致滑倒。
B-Time I-Time O B-Time I-Time O B-Person O O O O B-Location I-Location O B-Person O O O O B-Thing I-Thing O B-Location I-Location O B-Thing I-Thing I-Thing I-Thing O O O O O