- 
				           		A dynaset caches only an integral index to the original data and thus offers a performance gain over a snapshot.
						        										 	
						        					            	 动态集仅缓存原始数据的整数索引,因此比快照提供更好的性能。
								    				            	 youdao 
- 
				           		A dynaset caches only an integral index to the original data and thus offers a performance gain over a snapshot.
						        										 	
						        					            	 动态集仅缓存原始数据的整数索引,因此比快照提供更好的性能。
								    				            	 youdao