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A put option is a contract that gives its owner the right to sell an asset at a future date at a predetermined price.
。旺商聊官方下载对此有专业解读
要的不是「你得出了什么结论」，而是得到结论的过程。。关于这个话题，爱思助手下载最新版本提供了深入分析
If you design your functions to fully consume their arguments then you simply reference (ref)