Let me reverse engineer the situation for you. You would have considered this additional activity as a blocking stone and kept on procrastinating and increased your stress levels reaching nowhere.

让我帮你回顾一下情况，你可能将这额外的事情看作是绊脚石，然后一直犹豫，倍感压力无法前进。

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William Rankine, a Scottish engineer and one of the fathers of thermodynamics, was the first to explain how these repeated stress reversals could cause cracks to propagate.

苏格兰工程师和热力学创始人之一的威廉·兰金(William Rankine)是第一个解释这些重复的应力反向如何能够导致裂缝蔓延。

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The rhythmic stress helps align the fibres of the developing artery, making them twice as strong, says Laura Niklason, a tissue engineer at Yale University.

耶鲁大学的组织工程师劳拉·尼克拉森周期性的压力有助于培育中的动脉形成纤维，并使其成倍增强。

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William Rankine, a Scottish engineer and one of the fathers of thermodynamics, was the first to explain how these repeated stress reversals could cause cracks to propagate.

ECONOMIST: Aircraft fatigue