>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, and 2mm at [Cheung Chau][4]. And a storm that affects a larger area with 3mm 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