double-edged sword 雙刃劍
earth-shaking changes 翻天覆地的改變
energy crisis 能源危機
depletion of resources 能源消耗
milestone 里程碑
sophisticated equipment 尖端設備
technical innovation 科技創(chuàng)新
expediency 權宜之計
scientific invention 科學發(fā)明
a heated discussion 熱烈的討論