The two things are the same in their appearances, but different in kind. 这两件东西外表相同,但实质上是不同的。
The basic representation unit in most rule-based expert systems. Similar to variables in traditional data processing, but different in that they may own properties, and do not necessarily represent memory storage locations. 在大多数基于规则的专家系统中的基本表示单元。它类似于传统数据处理中的变量,但有不同之处,属性可具有性质,而不一定代表记忆存储单元。
The two things are the same in outward form but different in essence. 那两样东西在外表上相同,但在本质上不同。