If you imagine yourself tossing a ball in the air in front of a mirror, P symmetry seems intuitively obvious.
想像如果你在镜子前面丢球，P对称看来是无庸置疑的。
Steele, K. M. , T. N. Ball, and R. Runk, " Listening to Mozart does not enhance backwards digit span performance. " Percept Mot Skills, 1997. 84 (3 Pt 2): p. 1179-84.
听莫札特的音乐并不会增强在数字回朔测验中的表现〉 《知觉技能与运动技能》，1997。84 （第3册第2部分）：1179-84页。
On this base, it presents a novel view which thinks the ball sports should be basic teaching materials of p.
在此基础上，提出以球类项目作为中学体育基本教材的新观点，并对其可行性做出有力的论证。
Just imagine those P. E. teachers we all had at school who'd shout 'You passed the ball where he was, not where he was going!'
其实，回想一下，我们在上学时，体育老师们总是高喊：“把球传到他的位置，而不是传到他要跑动的位置！”
Just imagine those P. E. teachers we all had at school who'd shout 'You passed the ball where he was, not where he was going!'
其实，回想一下，我们在上学时，体育老师们总是高喊：“把球传到他的位置，而不是传到他要跑动的位置！”
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