they can never let down their guard... 也绝不能放松戒备
a potent cocktail of acid rain poured down. 威力强大的酸雨倾泻而下
while hunting down his next victim. 它必须经常停下来确认方向
...their tiny filaments helped to break down rock 它们的细丝帮助将岩石分解
It can bite down and crush its prey. 它能咬住并咬碎猎物
With neither backing down, a fight is inevitable... 双方都不退让 争斗无可避免
With little food on offer, down here, they're rare. 在这里 食物很少 因此它们的数量也很稀少
The youngster refuses to back down. 年轻的骇鸟拒绝退让