balancing tunnel meaning in English

平衡坑

The spokesman said issues in relation to tunnel construction , including loss and contamination of ground water , subsidence and blow - out , will be addressed by way of the use of an earth pressure balance tunnel boring machine which has been proven to be very successful in the construction of one of the most difficult sections of the west rail , the tsing tsuen tunnel
九铁发言人指出，透过使用土压平衡隧道钻挖机，可以解决各种建造隧道的问题，如地下水流失和污染、土地沉降及泥浆从地底涌出等。西铁即采用了相同的钻挖机完成其中一项艰钜的工程