名词短语
中文翻译：下切成形附件
同义词：
['undercutting attachment', 'undercutting fastener', 'undercutting fastening device']
例句：
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1. The engineer used a special tool toundercut the metal for the new design.
工程师使用特殊工具对金属进行下切，以适应新设计。
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2. The undercutting attachment was designed to improve the strengthand durability of the joints.
下切成形附件的设计旨在提高接头的强度和耐用性。
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3. The undercutting fastenerwas used to secure the components together duringassembly.
下切成形紧固件在组装过程中用于固定组件。