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.
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.