Under Section 512 of the Digital Millennium Copyright Act, when a platform receives a takedown for user-submitted content, they are obligated to remove it or face potential liability for copyright infringement. This is why platforms like Twitch and YouTube will automatically remove any item that receives a takedown request. It’s the safest option, because at a certain scale, it is impractical for large platforms to evaluate the validity of every single takedown request they receive.
They are a safety net - it means that you can refactor the code (e.g. split or merge classes or functions) and tests still pass. If you can’t refactor anything without breaking the tests, something is not right.
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上世纪90年代起，药品附条件上市审批在美国、欧盟、日本等多国先后实施，成为一种国际上通行的审批方式，国内亦在2017年开始批准药品附条件上市申请。据丁香园insight数据库，2021年至2025年，每年均有20多款，共计超120款药物通过该方式获批。
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