无时滞地震勘探专用雷管的英文

no-lag seismograph cap

• 无:    not have; there is ...
• 时:    shí]
• 滞:    stagnate; block up
• 地震勘探:    seismic prospectin ...
• 专用:    special use; for a ...
• 雷管:    detonator; explode ...