- 
				           		Be a primary element type, such as a string or a number.
						        										 	
						        					            	 是主要的元素类型,例如字符串或数字。
								    				            	 youdao 
- 
				           		The row key is the primary key of the table and is typically a string.
						        										 	
						        					            	 行键是表的主键,通常是一个字符串。
								    				            	 youdao 
- 
				           		The row key is the primary key of the table and is typically a string.
						        										 	
						        					            	 行键是表的主键,通常是一个字符串。
								    				            	 youdao