In addition to being major business centers,the large cities offer scenic attractions and cultural entertainment for all kinds of people with a variety of tastes.Cultural events occur frequently,including theatrical and operatic performances,concerts,ballet,and art exhibition,to name just a few.At the opposite end of the scale,there is a great variety of nightlife in urban centers to choose from,and there is also a wide selection of restaurants.Shopping is an attraction for many visitors,whether in the great department stores of New York,Tokyo and Hong Kong or in the boutique of Paris and London. Many big cities also offer a unique atmosphere and history.The Great Wall and the Palace Museum of Beijing and the flower vendors and cable cars of San Francisco are part of the unusual atmosphere of those cities. occur2.(+adv/prep)to be found;exist(尤指非活着的事物被发现；存在 That sound doesn't occur in his language,so it is difficult for him to pronounce..他的母语里没有那个音，所以他发那个音很困难。 occur to(无被动语态)(of an idea)to come to(omeone's) mind. (主意)浮现于脑中；被想到（起） The possibility that she might be wrong never occurred to her. 她根本没想到她可能会错。 It suddenly occurred to me that we could use a computer to do the job 我突然想到我们可以用计算机来做这项工作。In addition to being major business centers, the large cities offer scenic attractions and cultural entertainment for all kinds of people with a variety of tastes. Cultural events occur frequently, including theatrical and operatic performances, concerts, ballet, and art exhibition, to name just a few. At the opposite end of the scale, there is a great variety of nightlife in urban centers to choose from, and there is also a wide selection of restaurants. Shopping is an attraction for many visitors, whether in the great department stores of New York, Tokyo and Hong Kong or in the boutique of Paris and London. Many big cities also offer a unique atmosphere and history. The Great Wall and the Palace Museum of Beijing and the flower vendors and cable cars of San Francisco are part of the unusual atmosphere of those cities. occur 2. (+adv/prep) to be found; exist (尤指非活着的事物)被发现;存在 That sound doesn’t occur in his language, so it is difficult for him to pronounce.他的母语里没有那个音，所以他发那个音很困难。 occur to (无被动语态) (of an idea) to come to (someone’s) mind. (主意)浮现于脑中；被想到(起) The possibility that she might be wrong never occurred to her . 她根本没想到她可能会错。 It suddenly occurred to me that we could use a computer to do the job. 我突然想到我们可以用计算机来做这项工作