IT WAS ESSENTIAL THAT THE GRINDER STAY WITHIN THE HARD BEDROCK LAYER OF THE EARTH TO GIVE THE TUNNEL THE STABILITY THE SCIENTISTS REQUIRED.

• 挖掘中重要的是要始终让钻头留在地下坚硬的岩床层中,以便使对撞机的轨道始终保持科学家们要求的稳定。