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				           		如果密度正好等于临界密度,宇宙则是平坦的,但很可能仍然是无限的。
						        					            	 If the density just equals the critical density, the universe is flat, but still presumably infinite.
								    										 
								    				            	 youdao 
- 
				           		如果密度正好等于临界密度,宇宙则是平坦的,但很可能仍然是无限的。
						        					            	 If the density just equals the critical density, the universe is flat, but still presumably infinite.
								    										 
								    				            	 youdao