A material witness failed to appear in court.

一名重要的证人没有出庭。

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Urban texture, as the relatively deep material content of city formation, is the direct witness to the history of a city.

城市肌理作为城市形态中比较深层的形态物质内容，是城市历史最直观的见证。

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The witness produced a new material fact.

证人提供的新的实质性证明。

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And initially when he was arrested, government authorities designated him a material witness to terrorism.

NPR: Padilla Appeals His U.S. Captivity

After the September 11 attacks, Moussaoui was held as a material witness and sent to New York to be questioned.

CNN: Sept. 11 suspect to be tried in Virginia

He is an Algerian waiter who was reportedly questioned by the FBI and taken before a federal grand jury as a material witness.

CNN: Supreme Court requests government to justify secret detention