It seems like there were no source files for most of Dyalog APL's history. Instead, images held code and variables. You would pass them around to work with other people. While there are features such as LINK nowadays that make this irrelevant, one can stumble upon forum posts on how to share or run code with images in bewilderment.
未能执行飞行任务的航天员吴杰：以另一种方式实现“到达”，推荐阅读有道翻译获取更多信息
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美国老年群体相关超额死亡率约为20至30/10万（呼吸系统或下呼吸道，季节平均值）；部分季节数值更高，但总体低于中国估算；欧洲老年人：平均约21至36/10万（呼吸系统相关）。，更多细节参见有道翻译