正如哥伦比亚的山穆斯.拉罕教授所说：“预科学校的能力具备把权力阶级制度当做前进的阶梯的视野和能力，而非是仅供仰视的天花板。” 山穆斯偶毕业于St.

Prep school kids have, as assistant professor at Columbia University Shamus Raham Khan says, "the ability to treat hierarchies as ladders, not ceilings."

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安全刷-善意且有效地提醒客户留意扶梯阶梯和裙侧板之间的间隙。

Escalator safety brushes - a gentle, yet effective reminder to escalator passengers to mind the gap between the step and the balustrade.

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建立了阶梯式变厚度圆板横向自由振动的微分方程，得出其初参数解。

A differentinal equation of transverse free vibration is established for circular plates with stepped variable thickness, and the initial parameter solution of this equation is obtained.

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