The results show that the synthesized precursor is an organosilicon compound and its dried and roasted product is cordierite.

结果表明，合成的前驱体为一种有机硅化合物，其干燥、煅烧后的产物为堇青石。

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Mainly researched was the effect on properties of PMN-PNN-PZT piezoelectric ceramics for different synthesizing process named precursor synthesis and oxide compound synthesis.

研究了前驱体合成(又称铌铁矿合成)与传统的氧化物混合合成，对PMN - PNN - PZT四元系压电陶瓷性能的影响。

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Previous researches found that tyramine, the precursor compound of octopamine, had comparative high antioxidant activity in concentration dependent manner.

既往研究指出，章鱼胺的前体化合物酪胺具有较高的抗氧化活性，且与其浓度呈正相关。

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One key element in searching for life on Mars is the presence of methane in the Martian atmosphere As a simple carbon compound, methane is often a precursor to the formation of the complex organic chemicals that make life possible.

FORBES: Curiosity Sniffs The Martian Atmosphere But Finds No Sign Of Life