common ancestry的用法和樣例：
例句
- Mr. Smith and the queen have a common ancestor in king Charles II.
查理二世國王是史密斯先生和女王的共同祖先。 - For instance, all birds and reptiles are believed to have descended from a single common ancestor, so this taxonomic grouping is called monophyletic.
例如，所有的鳥類和爬行動物被認為是從一個單一的共同祖先傳下來的，因此這個分類學的分組被稱為單系類群。
