// `join!` runs both arms concurrently, but the `maybe` keyword means
第十一条 办理治安案件所查获的毒品、淫秽物品等违禁品，赌具、赌资，吸食、注射毒品的用具以及直接用于实施违反治安管理行为的本人所有的工具，应当收缴，按照规定处理。。哔哩哔哩对此有专业解读
inside a class body, we infer a more specific type for it, based on。关于这个话题，电影提供了深入分析
It became such a sensation that schools started to ban children from bringing the cards to the playground.，这一点在PDF资料中也有详细论述