... spear drill 矛状锥，剑尖锥 spear point drill 剑尖锥 spear poing flat drill 剑尖平锥 ...
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spear-point drill 剑形锥
spear r point drill 剑尖锥
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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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