Electricity resulted in the invention of elevators, 电力导致电梯的发明

314. The manpower of millions of immigrants,
     百万移♥民♥的人力
315. The energy of coal,
     煤炭的能源
316. The unbridled power of oil.
     石油的无边能量
317. Electricity resulted in the invention of elevators,
     电力导致电梯的发明
318. Which in turn permitted the invention of skyscrapers.
     电梯又促使了摩天楼的发明
319. New York ranks as the 16th-largest economy in the world.
     纽约经济是世界第16强
320. America was the first to discover, exploit and harness...
     美国第一个发现 开采 并掌握了

来自《家园 第一部分 Home Part1》第 317 行