All data in a CouchDB database is stored in a document, and each document can be made up of an undefined number of fields.

CouchDB数据库中的所有数据都储存在一个文档中，并且每个文档可以由未定义的字段组成。

youdao

They hold only one piece of data: a string, a number, the undefined value, a reference to another variable.

它只保存一段数据：一个字符串、一个数字、未定义的值以及对另一个变量的引用。

youdao

In addition, by using the hole edges conditions, the relationship between undefined coefficients is set up, to reduce the number of those coefficients, and only the boundary collocation is needed.

同时，利用内孔边界条件，建立待定系数间的关系式，以减少待定系数的数目，并且只需要在外边界配点。

youdao