- was the evolution of parental care.
父母照护的进化 - Giving birth to live young
生下活的幼崽 - and nourishing them on their mother's milk
用母亲的乳汁滋养幼崽 - until they reach independence.
直到其独♥立♥ - But for these nervous little youngsters...
但对于这些紧张的幼崽们来说 - that might take a while.
这可能需要一段时间 - Most early mammals didn't have armor or size to protect them...
多数早期哺乳动物 没有护甲来保护它们
until they reach independence. 直到其独♥立♥
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