Rigs form a dense ring around the tribe’s borders; only recently has drilling begun within.
钻井机密密麻麻地在部落边境上围成一个圈，直到最近才开钻。
2
Rigs form a dense ring around the tribe's borders; only recently has drilling begun within.
钻井机密密麻麻地在部落边境上围成一个圈，直到最近才开钻。
3
With cars, milling, boring, drilling four automation function, can be turning sphere, cylinder, cone, thread, tapping, end face, inner and outer ring groove, etc.