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knurl
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节,瘤,隆起
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详细解释：
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以下为句子列表：
英文: Insert nut is designed for rapid installing into thermo-plastics by means of ultrasound. Its two opposite helical knurl bands provide a combination of high torque and pulling out resistance.
中文: 压入式螺母通过加热或利用超音波可快速安装到热塑性塑料中,它的两道相反旋向的压花带可提供较高的抗扭转和抗拉拔能力.
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