In other words , multiple approaches are needed to meet a variety of decision situations 换句话说,面对各种各样的决策情况需要多种的方法。
Thus , on many occasions a variety of approaches will be discussed , and the ( recent ) historical development of these approaches are emphasized 因此,在很多情况下,多种的方法都将被讨论,而且这些方法(最近的)历史发展也是重点。