By midsummer, the surface nutrients have all been absorbed. 直到夏至 海洋表面的养分全部被摄取

167. and seemingly delight in doing so.
     看起来他们也喜欢这样做
168. Dusky dolphin, often in pods two hundred strong work together to reap the harvest.
     200条暗色斑纹海豚聚集在一起 紧密合作,尽情收获
169. They break up the shoals into smaller, more manageable balls, and all the hunters benefit.
     它们将鱼群分成许多小群, 让猎人们更加易于处理.
170. By midsummer, the surface nutrients have all been absorbed.
     直到夏至 海洋表面的养分全部被摄取
171. The algae die and the food chain collapses.
     藻类死亡 食物链因此崩溃
172. In a few special places, however
     然而在少数特别的地方
173. the temperate seas sustain these levels of life throughout the summer.
     气候温和的海域维持这个生命水平贯穿整个夏季

来自《行星地球 第一季 第九集 Planet Earth S01E09 海洋》第 170 行