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劉先生說，在物流管控都放寬之後——快遞經過二次安檢依然可以寄往北京，和張女士一樣，他開始感覺「兩會」這個概念消散掉了。。关于这个话题，51吃瓜提供了深入分析
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.