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That which precurses: a forerunner, predecessor, or indicator of approaching events. / (chemistry) One of the compounds that participates in the chemical reaction that produces another compound.

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precursor

/ˈpɹiːˌkɜɹ.səɹ/

noun

That which precurses: a forerunner, predecessor, or indicator of approaching events. / (chemistry) One of the compounds that participates in the chemical reaction that produces another compound.

The discovery of fire was a precursor to the development of civilization.

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That which precurses: a forerunner, predecessor, or indicator of approaching events.

Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis:[…]. The evolutionary precursor of photosynthesis is still under debate, and a new study sheds light. The critical component of the photosynthetic system is the “water-oxidizing complex”, made up of manganese atoms and a calcium atom.

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意味（2）

(chemistry) One of the compounds that participates in the chemical reaction that produces another compound.

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precursor

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