Expert testimony is such a process that in a suit, the appraiser uses technology or expertise to distinguish and estimate the technical problem related with the suit, and provides suggestion.

• 司法鉴定是指在诉讼活动中，鉴定人运用科学技术或者专门知识，对诉讼涉及的专门性问题进行鉴别和判断，并提供鉴定意见的活动。