A/S铝硅比aart.一(个)；每一(个)；任一(个)n.英语字母表的第一个字母；学业成绩得优者；表示“最好”的符号a woman of forthright views观点明确的女子A configuration of signs.一种符号之构型。a continuance of prosperity持续的繁荣a hearty voice/handshake开心的声音；有力的握手a constitutional monarch.立宪制君主A compulsory examination.必要的考试a logically valid deduction符合逻辑的推论a marvel of medical science医学上的奇迹a blocked/leaking gutter堵塞了的/漏水的檐沟a person of stern rectitude刚正不阿的人.

1. Stress is a known memory buster.
   压力是记忆的阻力。
2. Friction is a form of resistance for an object in motion.
   摩擦力是一种阻止物体相对运动的阻力。