In normal cells, p21 ACTS like a brake to block cell cycle progression in the event of DNA damage, preventing the cells from dividing and potentially becoming cancerous.
在正常的细胞中，如果DNA受损，p 21就会像刹车一样阻断细胞周期进程以防止细胞分裂和癌变。
One of important reasons is that the generation of brittle martensite due to brake sliding of wheels on rails leads to tread damage and its creep.
一个主要原因是车轮在钢轨上由于制动滑动产生的脆性马氏体所导致的踏面热损伤和蠕变。
If weak springs are reused, the shoes may drag against the drums causing accelerated shoe wear, brake overheating and possible drum damage.
大多数专家建议更换硬件当炉体鼓式制动器制动恢复适当行动。 如果弱弹簧重用，鞋，可能使对鼓鞋穿导致加速，刹车过热和鼓伤害。
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