Tā cóng gòngshí hé lìshí liǎng ge jiǎodù fēnxī zhè ge wèntí.
He analyzes this problem from both synchronic and diachronic perspectives.
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usage
The paired term is 历时 (lìshí, diachronic, across time). Saussure's foundational distinction in 普通语言学教程 (Course in General Linguistics) is rendered in Chinese as 共时/历时 — standard vocabulary in linguistics, semiotics, and history-of-ideas writing.