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。
The real open oil press brake, can make up the damage of exhaust.
真正的开放式油压碟刹，具有自动补偿磨损功能。
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