Despite the fact our common ancestor lived nearly 700 million years ago, the genes that determine where nerves and guts end up are amazingly similar among all bilateral animals.
尽管我们的共同祖先生活在近7亿年前，但决定神经和肠子终结处的基因在所有的双边动物中都惊人地相似。
Bilateral animal
原声例句
科学洞察双语版
英语百科
Bilateria
The bilateria /ˌbaɪləˈtɪəriə/ or bilaterians are animals with bilateral symmetry, i.e., they have a front ("anterior") and a back ("posterior") as well as an upside ("dorsal") and downside ("ventral"); therefore they also have a left side and a right side. In contrast, radially symmetrical animals like jellyfish have a topside and a downside, but no identifiable front or back.
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