There's no a priori reason to think your expenses will remain the same in a new city.不能想当然地认为你的开销在一个新城市会维持不变。In the absence of such evidence, there is no a priori hypothesis to work with.没有此类证据，就没有可以推理的前提。One assumes, a priori, that a parent would be better at dealing with problems.人们总是想当然地认为当了父母的人更善于处理问题。