阶段爆破；超前工祖爆破；硐室爆破的英文

heading blast

• 阶段:    stage; phase; peri ...
• 爆破:    blow up; blast; bu ...
• 超前:    speed-up; outstrip ...
• 工:    worker; workman; t ...
• 祖:    grandfather
• 硐室:    chamber