Lets assume, we would double, triple, quadruple, etc. Bobs world and stack these copies on top of each other. Bob would never notice, as long as each copy is just a “shallow” copy, meaning that each movement in the fundamental domain (the original world) is mirrored in the copies. In this case, we would have a covering space of Bobs world, and the original world would be the base space.
这一经典双药方案也迅速扎根中国市场，推动国内脱发治疗从 “民间调理” 向 “科学用药” 转型。2001 年，三生制药引进米诺地尔酊（蔓迪），成为国内首款上市的米诺地尔外用制剂；2003 年，默沙东的非那雄胺片正式在国内获批上市，填补了国内口服抗脱处方药的空白。
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