在商业世界里，风险永远不会消失，只会被转移。合伙人模式，本质上就是风险的分摊与下沉。
By pushing side effects to the edges and keeping our core logic pure, we gain a deterministic and secure execution trace. As a result, debugging shifts from guessing what might have happened to watching exactly what did happen, all without compromising user privacy.
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a.download = `${filename}.m4a`;