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1.The engineer used a stepped screw to tighten the bolts.
工程师使用阶梯螺丝来拧紧螺栓。
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2. The construction worker replaced the worn-out stepped screws with new ones.
建筑工人用新的阶梯螺丝替换了磨损的螺丝。
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3. The carpenter used a stepped screw to hold the wooden planks together.
木匠用阶梯螺丝将木板固定在一起。