Drawing on research into a specific historical event or phenomenon, show how the passage you've chosen makes sense of, or perhaps fails to make sense of its historical subject.
利用对特定历史事件和现象的调查，告诉我你所选的段落如何解释或是无法清楚解释历史事件。
Spring designing system provide important parameters for later spring drawing system, spring drawing system construct a picturize Passage for spring designing system.
弹簧设计系统为后续的弹簧参数化绘图提供了重要的参数，弹簧图库系统为前期的设计工作构建参数化绘图通道。
Circle new words and phrases in the passage. Try to comprehend the meaning via drawing inferences from the storyline.
从课文中画出生字生词，并尝试推断词义。若无法理解，查询词典。
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