There must also be sunlight. 还必须有阳光

145. In winter, the temperate seas are lashed by violent storms.
     在冬季 气候温和的海域被风暴肆虐着
146. The turbulence stirs the water, and draws nutrients up from the depths
     湍流激起海水 将深处的养分搅上来
147. but nutrients alone can not support life.
     但只有养分并不能维持生命
148. There must also be sunlight.
     还必须有阳光
149. In the spring, as the sun daily climbs higher in the sky
     春天 太阳高悬空中
150. the algae start to grow.
     藻类开始生长
151. Blooms the size of the Amazon Rainforest turn the seas green.
     旺盛的藻类占据着亚马逊雨林般大小的面积 它们将大海染绿

来自《行星地球 第一季 第九集 Planet Earth S01E09 海洋》第 148 行