86.In 15 or 30 seconds.a speaker cannot establish the historical context that shaped theissue in question,cannot detailthe probable causes of the problem,and cannot examine alternative proposals to argue that one ispreferable to others.
(以and连接的并列句)
在15或30秒的时间里,发言人无法建立形成正在讨论的问题的历史背景;不能详细阐述问题产生的可能原因;无法仔细审查几种建议以辩论哪一种更可取。
解析:
主句1:a speaker cannot establish thehistorical context
主句2:cannot detail the probable causesof the problem
主句3:and cannot examine alternativeproposals
从句1:that shaped the issue in question
从句2:to argue that one is preferable toothers.
主句1,2,3并列关系
从句1修饰主句1中的context
从句2修饰主句3的proposal