A kind of architecture supported by tremendous economic power, skyscrapers are often looked on as a sign of economic prosperity and social progress by the public and politicians.
作为一种以巨大的经济力量为支撑的建筑物，摩天大楼常被民众和政客视为展示经济繁荣、社会进步的标志。
He turns toward her repeatedly, a clear sign of an important social skill called joint attention-which, in this case, is an awareness that he and his mother are focused on the same thing.
他反复转向她，而这是一项重要社交技巧‘联合注意’的明确迹象，在此例中，联合注意指的是他和他的母亲专注于同一件事。
Instead, visitors can now sign into other sites using their existing identity on Facebook, the world's biggest online social network.
如今，访客可用其现有的在Facebook这一全世界最大的在线社交网络上的身份登陆其它网站。
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