So, given that differences in policies as they are implemented have become largely a matter of degree, why do centrist parties remain weak? Why have they failed to unite moderates on both sides of the ideological divide?
那么，既然左右两翼所实施的政策的分歧点大体上只在于程度，为何中间道路党派仍如此弱势？为什么他们不能团结意识形态对立的两面的温和派？