有许多安全问题的经营者，以观察：高空堕物，火灾，泥石流， …

There are a lot of safety issues for an operator to watch for: falling objects, fire, debris, …

youdao

有许多安全问题的经营者，以观察：高空堕物，火灾，泥石流， …

There are a lot of safety issues for an operator to watch for: falling objects, fire, debris, …

youdao