>这是否意味着每平方米3毫米是经验丰富的在一个特定>区域,或者这是否意味着这样的雨有一个体积总量>如果是分布在所有香港的高度是3毫米。>还是指每平方米?他们真的同样的想法。从根本上意味着它填补了雨量计((某种)[1])3毫米的高度。但是每个地方都有这样的经历同样会看到相同的雨。所以如果风暴袭击整个香港的机场,(在机场雨量计)的[2]将记录3毫米,所以将雨量计的其他城市。和(平,接触地面……如果水不吸收进入土壤或蒸发时间)每平方米会得到一个3毫米的深度……和该地区作为一个整体覆盖3毫米深的水。(当然水真正流速降等建筑和偏转,那么你会得到更多的水在某些地方,在其他人)。 In other words, 3mm is the height of whatever 3-dimensional [prismatic shape][3] you want to draw that was equally affected by the storm, be it a box with a square base of 1 m$^2$, a cylinder 1 km in diameter, a surface with a base of the entire city, etc. Now of course in reality, not every place does experience the storm the same. And so Hong Kong airport may get 3mm, but [Cheung Chau][4] may only see 2mm. And it's still true that a storm that affects a larger area with 3mm of rainfall does put down more total water quantity in entirety. If the same storm hits all of China, that's indeed a lot of water! But of course it's also a larger area to absorb that water. So regardless of whether it's a Hong-Kong sized downpour or a China sized rain system, if it puts down 3mm, it tends to have similar impacts throughout the region affected. As others mention, a day is a very common time period for reporting such values. But they can be reported for whatever time periods people wish. Often you'll hear values for a specific storm, which can be as short as a quick downpour, or as long as a multi-day typhoon/hurricane. It's whatever the person wants to report about. Usually they'll give the time period or subject. 3mm doesn't fall in 1 second, but [it can fall in a period much shorter than an hour][5]. Or it can be the accumulation from only a steady drizzle that lasts days. That's where the rainfall rates (often given in mm or inches per hour) can be worthwhile! [1]: https://en.wikipedia.org/wiki/Rain_gauge [2]: https://weather.gladstonefamily.net/site/VHHH [3]: https://en.wikipedia.org/wiki/Prism_(geometry) [4]: https://weather.gladstonefamily.net/site/45044 [5]: https://en.wikipedia.org/wiki/List_of_weather_records#Precipitation