This is the feather of eagle . The arrow that the tiptop waited can be used , the goose , the wild goose can not than . Feather length can make that what flies  distant the arrow . The stable pneumatic outer mould that this was the best in more distant ancientry .  
 
 
 
The sword of Qin imperial court ( 221-205 before the Christian era ) is the miracle simply ! The sword of 100 centimetres that the tomb   Qin emperor was found is winding by the heavy object pressure time discoverys , forms " the shape form of L" , but moving the heavy object opens as people , it has recovered the state sharp immediately . All shock  more than 100 archaeology men and scientist that digs up the field . Am I surprised to this right and wrong Chang Ling , and who knows the expert of metal ? The explanation tells I this probably ?
		 
		
		
		
		
		
		
		
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