shǐduān [top] 最接近于源头或起始点的部分
拿钢琴来说，键盘的始端，键盘的末端。
其结果，足底内侧动脉始端外径，男性为1。
The result shows that the original outer diameter of medial plantar artery is 1.
认为，峰顶设在连接峰顶平台与加速坡竖曲线的始端较为合理；
The more reasonable position of hump crest is the point Where the hump platform connects with the vertical curvature of accelerating grade.
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