The equal length of shoulder blade and upper arm bone and the balanced angulation between the two allows for good extension of the front legs.

• 从前面后后面观察，动作准确：前肢既不向内弯，也不向外翻，后肢不交叉。很明显，肌肉发达的大腿和结实的飞节协同工作，提供后蹬力和驱动力。