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。