Sìbǔrǔpáxíngdòngwù shì bǔrǔ dòngwù de zǔxiān lèi qún.
Mammal-like reptiles are the ancestral group of mammals.
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Modern phylogeny calls them 合弓纲 (Synapsida) rather than 爬行动物 - they are not true reptiles but the sister group that gave rise to mammals. 似哺乳爬行动物 survives as older textbook terminology, literally 'mammal-resembling reptiles'.
