making them perfectly adapted to hunting in burrows 使它们完全适应了在洞穴中捕猎
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
and nourishing them on their mother's milk 用母亲的乳汁滋养幼崽
using antibiotics carried in their saliva to help them heal. 使用其中含有的抗生素 来帮助它们痊愈
giving them more time to raise their young as part of a family. 这让它们有更多时间 来照顾作为家庭成员的幼崽
But just as these huge dinosaurs were devouring the plants around them, 但就在这些巨大的恐龙 吞食周围的植物时
helps them maintain a higher body temperature day and night. 帮助它们在白天和黑夜 维持更高的体温