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1.The carpenter used a conical dowel pin to secure the joint.
木匠用一个圆锥形的榫钉来固定接合处。
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2. The construction worker used a conical dowel pin to fasten the wooden beams together.
建筑工人用一个圆锥形的榫钉将木梁固定在一起。
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3. The engineer used a conical dowel pin to reinforce the structure's load-bearing capacity.
工程师使用一个圆锥形的榫钉来增强结构的承载能力。