Every night, wherever conditions are right, countless millions of creatures from the deep migrate to the surface, seeking food. 如果环境适宜, 每天晚上会有无数的深海生物到海面来觅食
Huge shoals migrate from their overwintering grounds in the depths 大量鱼群从海洋深处的冬歇地赶来
Each year nearly two million animals migrate across the Serengeti plains 每年都会有将近200万只角马 横越塞伦盖蒂平原
It's now becoming clear that great whites migrate thousands of miles across the oceans 可以肯定的是 大白鲨长途跋涉数千英里横越大洋
Every year three million caribou migrate across the Arctic tundra. 每年 300万迁徙的北美驯鹿 都将穿越北极苔原