问题从这里提出：“始发阶段”是否相当于瘤前病变？
The question arises here; does initiation correspond to pre-neoplasia?
步幅过大是导致在始发阶段时阻力过大的主要原因之一。
Overstriding is one of the key contributors to excessive braking during the stance phase.
缺乏有效的技术，有些运动员可能会在腾空阶段产生很大的速度，而在始发阶段出现问题，阻碍他们的向前运动。
Athletes without efficient technique may be capable of generating substantial speed during the flight phase, but a jarring stance phase can hinder their forward progress.
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