但在所有经济，人口结构和社会的相似性之外，民意调查如今在英美两国都面临着非常类似的挑战和不确定性，因为传统政治忠诚和两党主导体系都在分崩离析。
But, in addition to all the economic, demographic, and social similarities, opinion polling in the US and Britain now face very similar challenges and uncertainties, owing to the breakdown of traditional political allegiances and dominant two-party systems.