An element of _________ on the part of the audience is interwoven into the multi-era saga, for two actors portraying the same character at different phases of life are distinguishable enough that the audience is able to discern differences for which the mere passing of years cannot account.
首先要知道on the part of这个短语≈coming from,也就是说前半句的意思是the audience doesn't believe sth. in the multi-era saga;为什么呢,后半句解释了原因,两个演员饰演同一角色不同年龄段的差异不光光是岁月的流逝所能解释的,而这种差异足够明显让观众察觉到。