If no columns satisfy the requirement for a default partitioning key, the table is created without one, which means the table cannot span more than one partition.
如果没有列能满足作为默认分区键的条件，则表在创建后就没有分区键，也就意味着这个表不能横跨一个以上的分区。
If a table is used, the condition can span an arbitrary number of lines as long as identifiers, such as field names, are not word-wrapped.
如果使用表，条件可以跨任意数量的行，只要字段名称等标识符不跨行即可。
For example, they can have table cells that span multiple rows and columns, with an application of a variety of styles and embedded objects and media.
例如，可能有跨行和跨列的单元格，以及大量样式和嵌入对象和媒体的应用程序。
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