Some people are so terribly insincere you can never tell if they are telling the truth.
有些人非常虚伪,你根本说不准他们是否在讲实话。
《柯林斯高阶英汉双解学习词典》
Your judgment of the case is based on the presupposition that the witness is telling the truth.
你对这案件的裁决,是以证人讲的都是实话这一假设为依据的.
《简明英汉词典》
