但是，我们的经验显示，表达所需的查询逻辑通常并不需要两种语言的嵌套层次超过一层。

But, our experience shows that nesting the two languages more than one level deep is usually not needed to express the desired query logic.

youdao

EPL是一种强大的语言，可使开发者实现对事件的全程查询(从输入数据中“提取”事件并调用你的业务逻辑(POJO))。

EPL is a powerful language that enables you, the developer, to implement a comprehensive range of queries to "extract" the events from the incoming data and invoke your business logic (POJO).

youdao

逻辑程序设计语言hprolog是一种类prolog语言，它将主要作为一种推理数据库的查询语言。

Logic programming language HPROLOG is a prolog-like language. It is mainly a deductive database query language.

youdao