They presented an unanswerable case for more investment.
他们提出了一个无可争辩的理由，要求增加投资。
1.不能回答的,(议论等)不能辩驳的;没有责任的 (for)
1.an unanswerable question has no known answer
2.impossible or very difficult to prove wrong or false
1.Nor aught else, except a brief, pithy, and, AS it then appeared to him, unanswerable argument against the immortality of the human soul.
也想不起别的，只是说了一句简练的反对人类灵魂不朽的话，他当时觉得这是无可辩驳的论点。
2.As this was an inane and unanswerable argument Benjamin made no reply, and from that time on a chasm began to widen between them.
这一番无理之词让本杰明哑口无言。从这时起两个人之间的关系开始出现了裂痕。
3.How much, how soon? You ask too many unanswerable questions, Grasshopper.
多少钱，多久能提车？你问了太多无法回答的问题，小子。
4.How much he still drinks is another unanswerable question, though he enjoys wine at official functions.
尽管他在正式场合喜欢喝葡萄酒，但他目前的酒量也是一个无法回答的问题。
5.You know there coming: Those seemingly unanswerable questions that pop up during job interviews.
你知道该来的总会来：那些看起来无法回答的问题总会在求职面试的时候突然冒出来。
6.'You know they're coming: Those seemingly unanswerable questions that pop up during job interviews.
你知道该来的总会来：那些看起来无法回答的问题总会在求…
7.Together, these Oscar favorites ask a virtually unanswerable question: What makes a movie the best of the year?
归结起来，这些奥斯卡大热门向人们提出了一个实际上无法回答的问题：到底是什么使一部电影成为年度最佳？
8.Amid China's uneven, 21st century boom, that remains an open and, for the moment, unanswerable question.
在中国21世纪不平等的繁荣中，这是一个没有答案，而且在此时无法回答的问题。
9.The milk-first school can bring forward some fairly strong arguments, but I maintain that my own argument is unanswerable.
当然“先倒奶”派能提出某些很强的论点，但我仍然坚持我的论据是驳不倒的。
10.Is that it? Are we left with the unanswerable ontological question: "To be, or not to be? "
我们是不是遇到了一个无法回答的本体论问题：“生，还是死？”