Today, they arc once again a familiar sight, playing roles that are often just as important for the community as their original purpose.

今天，它们再次成为人们熟悉的景象，扮演着与它们最初的目的同样重要的角色。

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In Figure 2, a transition is reflected by an arc with annotations for the event, an optional condition, and the action to be performed.

在图2中，转移是通过带有事件注释的弧线、可选的条件以及将要执行的动作来反映的。

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Within a couple of years of its founding, Federal had crafted for the Navy a chain of arc transmitters linking San Francisco with Hawaii.

在公司创建后的两年里，联邦电报公司为美国海军建立了一系列连接旧金山和夏威夷的电弧发射机。

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Mr Carter has a good feel for the arc America traced from the buoyant post-war optimism of the Apollo programme across the bridge of the Vietnam war to the pessimism surrounding Nixon's fall from power.

ECONOMIST: New fiction

Suffice to say, though, it manages a great character arc for Tony Stark and his relationships, plus spectacular special effects and action sequences that never detract from the examination of how the armor is poisoning Tony literally while his self-destructive behavior is poisoning his life figuratively.

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The kilometre-wide separation of the component satellites of Terrestrial Planet Finder should allow it to see planets in distant solar systems a problem akin to looking for moths flying around a football-stadium arc light that is several hundred kilometres away.

ECONOMIST: Birds of a feather