advanced science 尖端科学 double-edged sword 双刃剑 earth-shaking changes 翻天覆地的改变 energy crisis 能源危机 depletion of resources 能源消耗 milestone 里程碑 sophisticated equipment 尖端设备 technical innovation 科技创新 expediency 权宜之计 scientific invention 科学发明 a heated discussion 热烈的讨论