Fields or Columns: These are part of the table that holds the data. Columns must be assigned a datatype and unique name.
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A record or row contains a set of fields or columns containing data.
记录或行包含一组包含了数据的字段或列。
You can add a column directly or delete the fields from existing columns to make room.
您可以直接添加一个列，或者从已存在的列中删除掉字段以腾出空间。
Often, metaprogramming frameworks need to allow aesthetic decisions, such as deciding which columns or internal fields are important for the users.
元编程框架经常需要支持一些外部决策，例如决定哪个列或内部字段对用户重要。
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