在半岛北部，海拔足够低，因此古玛雅人能够经由被称为竖井的深层排水口或深洞探及地下水位。

In the northern peninsula the elevation is sufficiently low that the ancient Maya were able to reach the water table at deep sinkholes called cenotes, or at deep caves.

youdao

第一年她颇有收获，发现了一口竖井，一些地下洞室和坑道。

Within the first year, she was rewarded by the discovery of a shaft and several underground chambers and tunnels.

youdao

水坝、矿山巷道、竖井、隧洞、江河海底隧道、地铁等地下工程开挖时采用注浆防渗帷幕；

Dams, mine tunnel, shaft, tunnel, River Cross Harbor Tunnel, subway excavation of underground works such as the use of anti-seepage curtain grouting;

youdao