More than a hundred years ago the city offered a bounty to ships which would bring to the port rock ballast instead of sand.
一百多年前，该城市对载运碎石而非泥土来港的船只提供奖赏。
The model test aimed to study hydraulic characteristics of buffer pit ballast discharge after rock clog in deep water was blasted.
试验对深水岩塞爆破后缓冲坑泄渣的水力特性进行了研究。
Even rock tools in use by heavy bump, not fresh out of stone ballast it up, but not as metal tools, as a result of deformation and destruction of accuracy.
在使用中岩石工具即使遭重物磕碰，至多掉几粒石碴而已，而不会像金属工具那样，因变形而破坏精度。
Subgrade excavation of rock using pneumatic drill and DTH drill Hole drilling, loose blasting in small and deep hole blasting, excavators and loaders loading ballast, dump truck, bulldozer tie.
正在翻译，请等待…路基挖石方采用风钻和潜孔钻打眼，小型松动爆破和深孔爆破，挖掘机和装载机装碴，自卸汽车运输，推土机配合。
Subgrade excavation of rock using pneumatic drill and DTH drill Hole drilling, loose blasting in small and deep hole blasting, excavators and loaders loading ballast, dump truck, bulldozer tie.
正在翻译，请等待…路基挖石方采用风钻和潜孔钻打眼，小型松动爆破和深孔爆破，挖掘机和装载机装碴，自卸汽车运输，推土机配合。
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