l猎户星座中的马头星云是最著名的暗星云。
L the Horsehead nebula in Orion is the best-known dark nebula.
被称为马头星云，它在1500光年远，嵌在巨大的猎户星云复合体中。
Fittingly named the Horsehead Nebula, it is some 1, 500 light-years distant, embedded in the vast Orion cloud complex.
介绍了地铁复八线大热区间隧道在复杂地层施工中地下水治理和马头门结构施工的配套技术，为类似工程施工提供了成功经验。
The paper gives a description of the ground dewatering at the construction site and the technique of constructing the access to the tunnel.
应用推荐