someone who tells the truth, especially about what is really happening in a situation

He said voters value the governor as a truth-teller who is more believable than traditional politicians. 他说，选民们重视州长，认为他敢讲真话，比传统的政客更值得相信。

These courageous truthtellers risk everything to shed light on wrongdoing. 这些勇敢的人敢讲真话，冒着一切风险揭露不法行为。