To find the reason why a drill might bring on a racing heart, Karibe divided the volunteers into low fear and high fear groups based on how much they feared a trip to the dentist.

为了找出钻头可能导致心跳加速的原因，Karibe 根据志愿者对看牙医的恐惧程度，将他们分为低恐惧组和高恐惧组。

youdao

Volunteers were played the sound of a drill while their brain activities were watched by a machine.

研究人员向志愿者播放了一种钻机的声音，同时用机器观察他们的大脑活动。

youdao

Father didn't use a drill, he used a thread.

我爸不用电钻，用线钻。

youdao

The muscular man is working hard to control a powerful drill that is cutting through the rock that surrounds him.

VOA: special.2009.03.23

"It is very expensive to drill bore holes in Somalia. It is a very lengthy, cumbersome process, although that is ideally the way to go.

VOA: standard.2009.10.06

"For too long,for a decade or more, there has been a cozy relationship between the oil companies and the federal agency that permits them to drill."

VOA: standard.2010.05.14

At 10:30 a.m. a drill consisting of lowering a lifeboat with crew members aboard began.

WSJ: Cruise Ship Lifeboat Accident Kills Five in Spain

Initially, engineers had hoped the Plan A drill would cover about 20 meters a day.

CNN: New drill arrives in Chile with great fanfare

Already a drill sergeant from Aberdeen has been sentenced to prison for up to 25 years.

ECONOMIST: The disciplines of war