The relief workers struggled on with dauntless optimism.

救援工作者们仍发扬大无畏的乐观主义精神 尽职尽责地努力工作

Among these prisoners was an old lawyer--a man with a strong face and a dauntless mien.

在这些囚犯中有一个老律师——一个有坚强的神色和一副无所畏惧的态度的人。

The goal has now been finally attained through their dauntless and persistent efforts.

经过他们百折不挠，再接再励的努力，现在终于达到了目的。

Even though there are myriad hardships and hazards, they can't stop the dauntless explorers.

纵有千难万险，也挡不住英勇的探险队员。

They are all dauntless soldiers.

他们都是勇敢的士兵。

When ignorance when, it is dauntless .

当无知的时候，是无畏的。