求翻译：当上层大气西风变强时动压强差会随之增加，为了保持等压面之间的压强差不变，高度差必然要减小以确保高度差引起的压强差减少。是什么意思？

When stronger upper-level westerly winds in the atmosphere, increases the dynamic pressure difference, in order to maintain constant pressure surface pressure difference between unchanged and height differences are bound to be reduced to ensure that the height difference of pressure difference caused by reduced.