The beginning of second crack is an indicator that the coffee is nearly done and you should be ready to end the roast very soon.
二爆的开始是咖啡豆接近烘焙好的指标，并且需要尽快关火结束。
It has been proved that shrinkage can't be used as the indicator of crack resistance of concrete and the evaluation experiments should be carried out under restrained conditions.
自由收缩值不能直接用于评价混凝土的抗裂性能，试验必须在约束条件下进行。
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