| 摘要 |
Aerodynamically favorable arrowheads such as pivotal blade arrowheads and/or blade-opening arrowheads that have a sharp cutting edge located upon their arrowhead bodies at a location forward of a corresponding main cutting blade cutting edge when in a penetrating configuration such that the arrowheads maintain favorable aerodynamic flight characteristics and cut target material in front of the main cutting blades when penetrating a target so as to eliminate the frictional drag that the otherwise dull arrowhead bodies would generate with the target before the main cutting blades began cutting target material thereinfront.
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