direct line of descent 嫡系 ; 世系世系
line of steepest descent 最速下降线
line of quickest descent 最速降线 ; [数] 最快速下降线
line of swiftest descent [数] 最迅速下降线
He traces his line of descent from the Stuart kings.
他的家族可追溯到斯图亚特王朝。
Richard must dispose of Clarence in order to clear the line of descent and seize the throne.
理查德必须处理克拉伦斯，以明确的界线后裔，抓住王位。
Prof Schurer traced the line of descent, originating from Edward III - Richard III's great great grandfather - all the way to Cumberbatch.
席尔教授追溯了血统系，从爱德华三世开始到理查三世高曾祖父——一直到康伯巴奇。
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