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。
When a combination is not possible or not yet implemented, the row in the data pool is excluded and the test action is undefined.
当一个合并不可能或者还没有被实现时，数据池中的行将会被排斥，并且测试活动是未定义的。
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。
The null values in the dataStore, which would by default show up as cells with the word "undefined" displayed inside, are re-rendered here as empty strings (cells with no data).
dataStore中是空值，默认情况下单元格中显示“undefined”，它将作为空字符串(无数据的单元格)重新呈现。
Artificial immune network clustering is often ineffective when there is noise or undefined cluster boundary in the data.
当数据集聚类边界不清晰或存在噪声干扰时，人工免疫网络聚类算法通常无法获得有效的聚类划分。
Artificial immune network clustering is often ineffective when there is noise or undefined cluster boundary in the data.
当数据集聚类边界不清晰或存在噪声干扰时，人工免疫网络聚类算法通常无法获得有效的聚类划分。
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