natural number
		
		
					
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																	Noun:
									
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										the number 1 and any other number obtained by adding 1 to it repeatedly										
																				
										 
																			
																 
							 
						 
					 
				
			 
		
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																							用作名词																						(n.)
											
										
										
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												Today we are going to classify natural numbers by seeing how many divisors they have.												
我们学习根据一个数约数的个数来对自然数进行分类。
												 
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												The cover pebbling number for lexicographic product graphs and some strong product graphs were determined.												
对一个图而言,满足此条件的最小的自然数即为此图的覆盖数。
												 
																					
																																 
						 
					 
				 
						
			
			
		 
		
		
		
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