Марк Эйдельштейн привлек внимание иностранных журналистов на модном показе14:58
村民卢森说：“我们夫妻在工地上干活，工作送上门，一年能挣六七万！”
，详情可参考体育直播
就像回答“抛开钱不谈，工作的意义在哪里”这样的问题一样，抛开的净是一些抛不开的因素。落到肖弘身上，大概可以理解为：谁说商业和产品的壁垒，就不算壁垒了。
it just works. no special machinery needed. the boolean operators distribute over derivatives the same way union does. derivatives are such a powerful and interesting tool that i will dedicate a separate post to them, but the main point is that they give us a simple and uniform way to handle all regular language features, including intersection and complement.