也就是说，实例不是用显式的“实例标识(instance ID)”来标识，而是用数据消息中的一些关键字域来标识。

That is, instances are identified not by an explicit "instance id" concept, but by some key fields within data messages.

youdao

事实上，reference主题的结构只指定关键字，但将域专门化实体添加到所有祖先元素中却是一个好的做法。

In fact, the structures of the reference topic specify only keywords, but it's good practice to add the domain specialization entities to all ancestor elements.

youdao

类成员和变量被默认为是公有的(在Dart中没有“public”这个关键字)，尽管对于Dart来说“public”仅仅是脚本，而并非一个涵盖整个页面的作用域。

Class members and variables are considered public by default (there's no "public" keyword in Dart), although "public" for Dart is not a scope that encompasses the entire page - just the script.

youdao