They were twirling a brace drill.
他们当时正在转动曲柄钻。
The cutting part of a drill usually pointed and threaded and is replaceable in a brace or bitstock or.
钻机的切割部分；通常是尖头的有螺旋状图案并且可以更换用在柱柄或上。
Be careful not to brace with your palms at any point of this drill, but spear with the fingertips.
小心不要支撑与你的手掌在任意点的，但枪钻的指尖。
Be careful not to brace with your palms at any point of this drill, but spear with the fingertips.
小心不要支撑与你的手掌在任意点的，但枪钻的指尖。
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