Impeller with against pine device, Mechanical seal face material USES silicon carbide - silicon carbide, durable, safe and reliable.

叶轮具有防松装置，机械密封端面材质采用碳化硅-碳化硅，经久耐用、安全可靠。

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The book says the saying began because a competitor's face was cleaned with a cloth towel or other material.

VOA: special.2010.11.21

Observations of the material coating the dark face of Iapetus indicate it has a similar composition to the surface material on Phoebe.

BBC: New ring detected around Saturn

Senators considering the president's nomination of Judge Alito to the Supreme Court face a mountain of material amassed during his 15 years as a judge on the federal court of appeals, but we assume they'll find some of the most revealing reading in his 65 dissents, separate opinions he wrote when he disagreed with the majority on the court.

NPR: Reviewing Alito's Dissents

To be sure, the material boys will face real challenges in the years ahead.

FORBES: The Real Winners Of The Global Economy: The Material Boys