A type of polymerization in which monomers add to a growing chain one at a time. This process typically involves reactive species like free radicals or ions. Examples include the production of polyethylene and polystyrene.

一种聚合类型，其中单体一次一个地添加到不断增长的链中。该过程通常涉及活性物质，如自由基或离子。例子包括聚乙烯和聚苯乙烯的生产。(yī zhǒng jù hé lèi xíng, qí zhōng dān tǐ yī cì yī gè de tiān jiā dào bù duàn zēng zhǎng de liàn zhōng. gāi guò chéng tōng cháng shè jí huó xìng wù zhì, rú zì yóu jī huò lí zǐ. lì zi bāo kuò jù yǐ xī hé jù běn yǐ xī de shēng chǎn.)