学界对言据标记“从X来说”有不同的解读，而从“信度调节”这一特定角度可以做出新的解释，即该言据标记的核心功能在于调节其后接断言“Y”的信度。按照“X”的语义特点，“从X来说”可以分为确指视角型与模糊视角型两类。对于信度充分型“Y”，“从X来说”承担“强化信度”功能，主要实现路径为：（1）命题成立全方位化；（2）陈述对象焦点化；（3）陈述内容精准化；（4）判定依据显豁化。对于信度不充分型“Y”，“从X来说”承担“提升信度”功能，主要实现路径为：（1）虚化视角；（2）程度调节；（3）转换视点；（4）条件特定。

This paper tries to make a new explanation from the specific angle of reliability regulation of the evidential marker “cong X lai shuo”. The core function of the evidential marker is to provide indispensable support for the insufficient confidence assertion Y. According to the semantic character of X, “cong X lai shuo” can be divided into definite perspective type and fuzzy perspective type. For Y with sufficient reliability, “cong X lai shuo” assumes the function of enhancing reliability by the following means: (1) making the proposition omnidirectional; (2) focusing the statement object; (3) making the presentation content precise; (4) making the judgment criterion clear. For Y with insufficient reliability, “cong X lai shuo” assumes the function of improving reliability by the following means: (1) blurred perspective; (2) degree adjustment; (3) perspective change; (4) specific conditions.