Community tools, like text messaging, that can tell you when pollen counts are up or smog levels are rising or a natural disaster is unfolding, can give you the information you need to act in a timely fashion.
交流工具，比如文字短信可以告诉你 什么时候花粉指数高或者烟雾级别正在上升 或者自然灾害正在来临 能够给你你需要的信息以采取及时的行动