求翻译：气象专家预计， 15日起至17日，将有一次较强降水过程，降雨落区和前一轮过程相差不多，但雨带发展趋势是自南向北扩散，自西向东加强。是什么意思？

Weather experts predict that on the 15th until the 17th, there will be a strong precipitation process, the rainfall off the area and before a process is similar, but the rain with the development trend spread from south to north, from west to east strengthen.

Meteorological experts estimate that 15 to 17, there will be a relatively strong precipitation, rain falls, and the first round, but rain is more or less with a trend is spreading from north to south, from west to east.

The meteorological expert estimated that, on 15th gets up to 17th, some time strong precipitation process, the rainfall falls the area and the preceding turn process difference are not many, but the rain belt trend of development is proliferates from the southing north, from west to east strengthens

Weather experts expect, from 15th to 17th, there will be a strong rain, rainfall zone and the former round amount to much, but rainfall trend is spreading from South to North, from West to East to strengthen.

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