名词
中文翻译：外部齿形
同义词：
['external gearing', "external gearing system例句：1. The company's new product line is designed to improve external toothing efficiency.（该公司的新产品线旨在提高外部齿形效率。）"]
例句：
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1. The company's new product line is designed to improve external toothing efficiency.
该公司的新产品线旨在提高外部齿形效率。
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2.The engineer was tasked with designing the external toothing for the new machine.
工程师被指派设计新机器的外部齿形。
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3. The external toothing of the transmission is critical for smooth operation.
传动系统的外部齿形对于平稳运行至关重要。