The class remained dumb when the teacher asked a formidable question.

类当老师问一个令人生畏的问题保持沉默。

youdao

Several answers have been proposed to address this fundamental question, but none has been proven-and even adequately testing them has proven to be a formidable challenge.

已经有几个答案被提出来来回答这个基本问题，但是没有一个被证明——甚至对它们的充分的检验也被证明是一个可怕的挑战。

youdao

Drilling hole slanting question is a quite complex question in the drilling technology. Hole curving is a difficult technical problem and a formidable matter regarding us which is urgent to solve.

孔斜问题，在钻探技术上是一个比较复杂的问题，孔斜这一课题对于我们是一个重要而又迫切需要解决的技术难题。

youdao

What is not in question is the formidable force of personality and political skill that enabled him to unite and hold together a broad leftist alliance always bubbling below the surface with ideological idiosyncrasies and internal divisions, and of the deeply personal bond of loyalty that Chavez commanded among the millions who made up his red T-shirted chavista power base.

CNN: STORY HIGHLIGHTS