第二个阶段，会增加一部分速度训练，包括乳酸门槛跑和长距离的反复跑。
Phase two, preparation, adds a layer of speed by introducing tempo runs and long repeats.
耶特则很好地平衡了耐力和速度训练所需要的长短距离的反复练习。
Yetter balances shorter repeats to build endurance with longer repeats for higher quality speed work.
帕米尔地区速度模型，经过反复分析测算，及几十次震例计算验证，可以推广使用。
Therefore, the velocity model for Pamir region is of wide usage through much estimation and more times of cases verification.
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