if (len === 0) return []; // 补充空数组边界，避免后续逻辑出错
I find it plausible to think that early humans began to observe, to feel the difference between right and left, and to ascribe qualities like “clumsy,” “awkward,” “crooked,” and “tired” to the less dexterous hand (it is interesting that these very terms still show up prominently in today’s modern languages) and correspondingly positive qualities to the right hand preferred by the majority. This process, intertwining emotion and cognition, can well be expressed in the terms of embodiment... The semantic values with which the terms for left and right are charged in almost all the languages examined for this survey could have their origin in this very process: embodiment turned into words.
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這些言論出現在習近平向解放軍發表的春節賀詞中，也是自2022年以來，他首次在年度賀詞中提及腐敗問題。
Nature, Published online: 25 February 2026; doi:10.1038/s41586-026-10132-3