在正常的细胞中，如果DNA受损，p21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。
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.
完成认知测验时，与受损害个体相比，正常个体步态呈规则周期性、抬脚速度更快，并且头部和躯体的运动也更迅速。
Healthy individuals demonstrated a more periodic gait with regular and higher velocity foot kicks and faster torso and head movement than impaired individuals when completing a cognitive task.
孕妇和幼儿是最易受损的人群，因为铅极易通过胎盘进入胎儿大脑，并且可以干扰其正常发育。
Pregnant women and young children are particularly vulnerable to exposure because lead easily crosses the placenta and enters the fetal brain, where it interferes with normal development.
这是一个细胞常规的、剔除受损物质和回收原料过程的一个正常部分。
It is a normal part of a cell's routine, removing damaged goods and recycling the raw materials.
注射完以后，这些原来记忆力受损的老鼠在记忆测试中，表现和正常老鼠一样。
After being injected, these mice, who also were memory-impaired, performed as well as normal mice in memory tests.
注射完以后，这些原来记忆力受损的老鼠在记忆测试中，表现和正常老鼠一样。
After being injected, these mice, who also were memory-impaired, performed as well as normal mice in memory tests.
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