Liǎng zhǒng wùzhì fǎnyìng shēngchéng le xīn de huàhéwù.
The two substances reacted to form a new compound.
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生成 has become extremely common in the AI era: 生成式AI (generative AI), AI生成内容 (AI-generated content). In chemistry, it means 'to form' as a product of a reaction.