Winter in the mountains returns fast and hits hard. 山里的冬天来得迅猛
So the bears must feed as fast as they can. 所以灰熊必须尽快进食
When she spots a chance, she must move fast. 一旦发现良机 必须快速行动
But these youngsters are fast learners, 但这些小羊学得很快
The crabs will have to fast, until the next carcass drifts down. 蜘蛛蟹必须尽快吃完.直到下一个畜体落下之前
their development switches to the fast track. 它们的生长过程就会切换到快车道
The cave angel fish feed on bacteria in the fast flowing water 洞穴天使鱼以急流中的细菌为食
There are advantages to life in the fast stream - 这些动物拥有在急流中生存的先天优势