六级Yet like many college teachers around the U.S., the faculty remain doubtful that their work as educators can be measured by a "learning outcome" such as a graduate's ability to investigate and reason.

然而，和美国许多大学教师一样，教师们仍然怀疑他们作为教育工作者的工作是否可以用“学习成果”来衡量，比如毕业生的调查和推理能力。

2017年6月六级真题（第一套）阅读 Section A

考研And whether the community's work contributes much to an overall accumulation of knowledge is doubtful.

社区的工作是否对知识的全面积累起到了很大的作用值得怀疑。

2013年考研阅读原文

高考One reason is that, according to findings of a new survey of office workers conducted by wakefield research for the it company citrix, most bosses are doubtful about remote working.

一个原因是，根据威克菲尔德研究公司（WakefieldResearch）为it公司citrix开展的一项针对办公室员工的最新调查结果，大多数老板对远程工作持怀疑态度。

2016年高考英语浙江卷（10月） 阅读理解 阅读C 原文

六级It's doubtful that a computer program can do that—at least, not without some undesirable results.

一个计算机程序至少能做到这一点是值得怀疑的，不是没有一些不希望的结果。

2017年12月六级真题（第二套）阅读 Section C

四级Americans are less doubtful when it comes to politics: 73% expect to see a female president in their lifetime.

美国人在政治上的疑虑较少：73%的人希望在有生之年见到一位女性总统。

2019年6月四级真题（第二套）阅读 Section C

四级But it’s doubtful that Americans will look favorably upon regulating their favorite vice.

但令人怀疑的是，美国人是否会看好监管他们最喜欢的恶习。

2012年12月大学英语四级真题试卷（1）

四级For as long as anyone can remember, Piedmont's character has been completely bound up with the West vaco paper mill: its prosperous past and doubtful future.

从任何人记事起，皮埃蒙特的性格就与西部瓦科造纸厂完全联系在一起：它繁荣的过去和令人怀疑的未来。

2014年12月英语四级考试真题（第1套）