| 1. | Should there be no electricity , people would still be living under the same condition as in the middle period of 19th century , relying on coal , wood , oil and natural gas for heat and light , and steam to provide power for industry and transportation use
没有电，人们就会在19世纪中期的条件下生活和工作，靠煤、木材、油、天然气等燃料获取热和光，靠蒸汽为工业和运输提供动力。 |
