The LHC, the world's biggest scientific experiment, has been built just outside Geneva in a circular tunnel with a circumference of 27km.
世界上最大的科学实验大型强子对撞机（LHC）建在日内瓦外的一个圆形隧道，周长27千米。
2
The Large Hadron Collider is a 27km-long circular accelerator that is being built at CERN, the European particle-physics laboratory near Geneva, specifically to look for the Higgs boson.