参考译文：植物将光转化为食物和氧气的过程叫做光合作用。
The process of changing light into food and oxygen is called photosynthesis.
电动机的作用是把电能转化成动能。
The function of electromotors is to transform electrical power into kinetic energy.
电动机的作用是把电能转化成动能。
The function of electromotors is to transform electrical power into kinetic energy.
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