HL：跟线

在机构文件，尤其是美国航空航天局（NASA）相关的资料中，“Heel Line”这一术语常被简写为HL，以提升书写和交流的效率。其标准中文释义是“跟线”，指代特定的基准或引导线。这种缩写方式便于在专业文档中快速记录和引用，确保信息传递的准确性与便捷性。

A skating figure executed with the skates heel to heel in a straight line.
一种滑冰动作既用冰鞋的后跟沿直线滑行。
It is used to level uneven seams of heel and thick them so as to make top line, hem and joints become smooth and neat.
适用于鞋靴修内口后之捶平修整作业。对鞋后跟凹凸不平的接缝，折边处太厚进行整平处理使鞋口、鞋面的折边或接合处平整美观。
The results show that the four failure modes were ranked from highest to lowest effect : slip along the foundation, non-uniform distributions of stress, tension crack of the floodgate heel in the upper stream and compression failure of the floodgate toe in the downstream line.
由计算结果看出，水闸闸室沿闸基面滑动为水闸的最主要失效模式，上下游应力不均匀、上游闸踵拉裂、下游闸趾压坏为次要失效模式。
With a heel kick, I placed the ball in front of me and, seeing the Betis goalkeeper coming off his line, I aimed the ball towards the far post, using a hook shot.
用脚跟一磕，我把球停在了我的前面，看到贝蒂斯守门员出来了，我用吊射把球打进了球门的远角。
A. Adult : Place heel of hands, one atop the other, on lower third of the sternum. Lock elbows and maintain shoulders in line with sternum.
成人：两手相叠，手掌放于第三胸骨处。双肘关节伸直双肩与胸骨对齐。

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