元素 (yuán sù) means “element (key component of sth); (chemistry) element; (math.) element (member of a set)”. It is an HSK 6 Chinese word in the HSK 3.0 vocabulary.
水由氢和氧两种元素组成。
Shuǐ yóu qīng hé yǎng liǎng zhǒng yuánsù zǔchéng.
Water is composed of two elements: hydrogen and oxygen.
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