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在我国北方某地国境线上，发生了一起越境敌特被我击毙的案件。公安局侦察科长李欣等奉命赶到现场，他们认定敌人搞的是双线派遣，另一特务已潜入境内。潜入的特务沿途布雷，老魏爷在追捕中触雷负伤。李欣奋不顾身跳崖排雷，跟踪追击敌人。潜入江城的特务，冒充转业军人，化名周英杰，与潜伏特务“紫貂”挂上了钩。“紫貂”通过“熊钟”这个联络工具，控制着代号叫“银狐”的特务康一挺，巧妙地指挥周英杰的活动。“紫貂”通过周英杰，与某国驻我国大使馆以外交官身份出现的间谍取得联系，又通过康一挺，借“八一四”战备工程总工程师夏明非之手，把周英杰安插在该工程当汽车司机。为了搞清敌人活动的来龙去脉，李欣以“安全检查员”身份，深入到“八一四”工程里去。“五一”游园会上，李欣以“上司”身份从康一挺口中知道敌人“上司”的代号叫，“紫貂”，同时知道敌人已把窃听器通过夏明非带到了市委战备工作汇报会上...这会子旁人都走了，就剩两家兄弟姊妹和秦淼等人，她便又笑起来。英王等人都点头，要看这老龟是不是对所有小孩子都喜欢。陈平对此很是期待，也不知道尉缭先生何时回来前来越国？想来这以后的越国相位必有其一。板栗正凑在娘跟前说话，因要压住这嘈杂的声音，不知不觉就提高了自己的声音。Deliberate practice does not deny the importance of situation, but in some best sellers, the mainstream methods that have been confirmed by learning science are placed in a humble corner. Tacit knowledge, which is closely related to learning, is ignored. A large number of studies in learning science show that the best way for adults to learn is not to practice alone, but to learn in situations. Effective learning is to enter relevant situations and find one's own "learning community". At the beginning, learners turn around important members and do some peripheral work. With the growth of skills, they enter the core of the learning community circle, gradually do more important work and eventually become experts.