At first, all four legged vertebrates were ectothermic, their body temperature changed according to their surroundings.

一开始所有的四脚脊椎动物都是冷血动物，它们的体温随着周围的环境变化着。

The squat four legged Gastonia's heavy load slows him down to four to five miles per hour.

四足矮壮的加斯顿龙沉重的负荷使它的速度只有每小时4到5英里。

The object of the class was take a four legged animal, it can be any animal.

这堂课的对象是一只四足动物，它可以是任何动物。

But if you remember the four legged creature like Boston Dynamics robots and you've picture 10 of them marching in unison while dragging something heavy, like some robotic sled dog army, then maybe you did have this in mind.

但是如果你还记得像波士顿动力学机器人这样的四腿生物，你会想到它们10个在拖着沉重的东西的同时齐齐行进，就像机器雪橇狗大军一样，那么也许你确实有这个想法。