代码重构：它没有直接甩代码，而是先思考了“设计模式”的选择（工厂模式 vs 策略模式），最终选择了适合扩展的策略模式。
[7] B. E. Bayer: “An optimum method for two-level rendition of continuous-tone pictures” (1973). ↑
。业内人士推荐91视频作为进阶阅读
NASA announces major overhaul of Artemis moon program amid safety concerns, delays: "We've got to get back to basics"
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