Not for flight but for warmth. 不是用于飞行 而是为了保暖

123. and excellent hearing.
     和出色的听觉
124. But his most eye-catching adaptation is his feathers.
     但它最引人注目的适应性是它的羽毛
125. Simple feather-like structures first appeared back in the Triassic.
     简单的类似羽毛的结构 最早出现在三叠纪
126. Not for flight but for warmth.
     不是用于飞行 而是为了保暖
127. Being able to stay warm
     能够保持温暖
128. means this branch of dinosaurs, the theropods,
     意味着恐龙的这个分支兽脚
129. can be active day and night...
     可以在白天和夜间活动

来自《我们星球上的生命 第一季 第五集 Life on Our Planet S01E05 巨兽阴影下》第 126 行