iBT TOEFL Topic Vocabulary Breakthrough Unit 003

iBT TOEFL Topic Vocabulary Breakthrough Unit 003
Author: Li Xiaolai

The Chicago architect Louis Sullivan’s career converges with the so-called Chicago School of architects, whose challenge was to invent the skyscraper or high-rise building, facilitated by the introduction of the electric elevator and the abundance of steel. The building’s skeleton could be erected quickly and the remaining components hung on it to complete it, an immense advantage for high-rise buildings on busy city streets.