One difficulty is that normal street traffic must often be allowed to continue during construction.

这种施工方式的困难之一是施工中交通不能中断.

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Small, old, dingy. An arched window with a view of Congress Street. Traffic noise floats up.

窄小 、 破旧 、 脏乱, 一扇朝向议会大街的窗子, 街道的嘈杂声传上来.

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