名词
中文翻译：骨干曲线
同义词：
['backbone', 'spine curve']
例句：
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1.The backbone of the economy is the manufacturing sector.
经济的核心是制造业。
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2. The spine curve of the car is a crucial part for safety.
汽车的脊柱曲线对于安全性至关重要。
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3.The backbone of the project was the research and development phase.
该项目的核心是研究和开发阶段。