| 1. | Electric firing is not permitted .
不允许使用电气爆破。 |
| 2. | Levelling is usually carried out with vertical drill holes .
整平爆破通常用垂直炮眼进行。 |
| 3. | Bench blasting is the most usual type of blasting work .
梯段爆破是最常用的爆破工程之一。 |
| 4. | For combustible materials, rupture disks should be installed .
对于可燃材料，应该安装爆破片。 |
| 5. | Detonation is an important factor in under water blasting .
起爆方式对于水下爆破也是一个重要因素。 |
| 6. | The balloon busted .
汽球爆破了。 |
| 7. | These bombs had be dug out, and exploded or rendered harmless .
必须把这些炸弹挖出，将它们爆破或使之失效。 |
| 8. | Sometimes the melted rock comes out with a great blast of pressure .
有时熔岩会迸发而出，产生巨大的爆破压力。 |
| 9. | There are many different materials which can be used as blasting mats .
许多不同的材料均可用做爆破防护垫之用。 |
| 10. | The basic charge calculations have been concentrated round bench blasting .
装药计算的重点主要放在梯段爆破上。 |
