Their best defense is to keep an eye on the danger, 它们最好的防御是警惕危险
they need little energy to keep warm... 所以它们不需要多少能量 就能保持温暖
At these altitudes, mammals must feed regularly to keep warm. 海拔如此之高 哺乳动物必须定时进食以保持体温
Feathers, that first evolved to keep dinosaurs warm, 羽毛最初进化是为帮助恐龙保暖
Despite the trilobite's armor, it makes sense to keep out of sight. 尽管三叶虫有护甲 但是保持隐蔽仍然是明智的做法
There's a huge explosion, and I just keep walking. 轰的一声爆♥炸♥ 我就潇洒离场
Keep those eyes roving, boys. Dave is a master of disguise. 都把眼睛瞪大了 兄弟们 戴夫可是伪装大♥师♥