underground简单

One of the most important changes the upgrades will bring is the segregation of the high-speed line from the regular one in certain urban centres through the construction of underground rail links.

升级改造将带来的最重要变化之一，是通过修建地下铁路连接线，在某些城市中心将高铁线路与普通线路分开。

A string of accidents, including the partial collapse of a cooling tower in 2007 and the discovery of an underground pipe system leakage, raised serious questions about both Vermont Yankee's safety and Entergy's management — especially after the company made misleading statements about the pipe.

一连串事故，包括2007年一座冷却塔的部分坍塌以及地下管道系统泄漏的发现，令人严重质疑佛蒙特扬基核电站的安全性和安特吉公司的管理——尤其是在该公司就管道问题发表误导性声明之后。

The shortage is compounded by federal immigration raids, which remove some workers and drive others underground.

联邦移民突击搜查使短缺问题雪上加霜，这些搜查让一些工人被遣送，又迫使另一些工人转入地下。