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1·Porpoising can be accomplished without even firing one arrow.

无需发射一根箭就可以完成纵向跳跃。

2·Easy to tune for vertical arrow flight, (porpoising) can be accomplished without even firing one arrow.

搭箭点在垂直方向上容易调节，甚至不用发射一支箭就能消除豚跃式跳动。

(1)finless porpoise江豚，江猪