同义词

n. ancestry，blood，descent，filiation

参考例句

1. group of genetically related organisms constituting a single step in the line of descent.
遗传上''。'相关'。''的有机体群，在世系线上组成了单独的一步。
2. group of genetically related organisms constituting a single step in the line of descent.
遗传上相关的有机体群，在世系线上组成了单独的一步。
3. Cell lineage strictly refers to a genetic line of descent, telling us the ancestry of a cell in question.
细胞谱系指遗传家系的传承，说明的是细胞的来源问题。

英英解释

n.
  1. the kinship relation between an individual and the individual's progenitors
  2. the descendants of one individual

网络释义

line of descent
血统系; 血统系, 起源系; 系谱;
line of quickest descent
最速降线; 最快速下降线;
line of steepest descent
最速下降线;
line of swiftest descent
最速下降线; 最速 线;
direct line of descent one's own clique
嫡系;