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。

youdao

Based on the experiments of constant temperature of S. P. F. with PMS steel of mirror, the characteristics of micro crystalline structure and its strengthening are studied.

对PMS镜面塑料模具钢进行恒温超塑成形试验，并对其显微组织结构特点及其强化机制进行研究分析。

youdao

After reflection at the point p, the beam of light travels towards the polished floor and reflects off it as if the floor is a mirror.

在p点的映像之后，光的光束对于被擦亮的地板传播并反映出好象地板也是一面镜子。

youdao

Researchers at H-P Labs found that Twitter can mirror the mass consciousness and predict with accuracy how well a movie will sell.

FORBES: Let The Betting Begin On Blockbusters And Bombs