Number of drill shaft 钻轴数
Number of drill bits 钻轴总数
The heart-tugging scenes arrive on schedule, along with the Shakespearean rap number and marching drill.
NEWYORKER: Renaissance Man
Curiosity will likely drill a number of shallow test holes, using the tailings to scrub the metal bit of any contaminants carried from Earth.
BBC: Curiosity Mars rover spins its rock drill
To drill a significant number of deeper wells could cost twice that.
ECONOMIST: Scientists have offered a solution to the arsenic wells
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