动词
中文翻译：Unknown
同义词：
['draw under', 'sketch under', 'underline', 'inscribe under']
例句：
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1. The artist carefully underdraws the outline of the figure before painting it.
艺术家在绘画之前仔细地勾勒出人物的轮廓。
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2. The writer underdraws the main points of the article before writing the conclusion.
作家在写结论之前先简要地勾勒出文章的主要观点。
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3. The engineer underdraws the design of the bridge before building it.
工程师在建造桥梁之前先绘制了设计图。