A put option is a contract that gives its owner the right to sell an asset at a future date at a predetermined price.
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Nature, Published online: 27 February 2026; doi:10.1038/d41586-026-00538-4
记者发现，浦北当地部分规模企业和小型收购商，已形成了这种“工艺皮”的造假供应体系，可自主加工或快速调配各类“年份”陈皮货品，个别企业年销新会原料数量惊人。