2-C. Steel frames improve elevator safety.Steel frames improve elevator safety.
鋼鉄の骨組みは、エレベーターの安全性を向上させる。
3-C. At the same time, elevator technology and fire-resistant building materials also helped make skyscrapers possible.At the same time, elevator technology and fire-resistant building materials also helped make skyscrapers possible.
同時に、エレベーター技術と耐火建材も高層ビルが可能になるよう支援しました。
4. In a elevator, "Which floor?" "Five please, thank you."In a elevator, "Which floor?" "Five please, thank you."