and nothing can afford to waste any energy. 一点能量都不能浪费

101. Farther down still, the blackness is complete.
     随着下潜深度增加,周围已经一片漆黑
102. No vestige of sunlight can penetrate as far as this.
     没有阳光可以照射到这么深
103. Food is very scarce
     食物非常缺乏
104. and nothing can afford to waste any energy.
     一点能量都不能浪费
105. A dumbo octopus simply flaps a fin
     小飞象章鱼拍打翅膀来游泳
106. no need for the jet propulsion used by it's shallow water relatives above.
     不象它的浅海亲戚利用喷射水流的反作用力
107. The weirdest, in this world of the strange,
     这个奇异世界中的最神秘生物

来自《行星地球 第一季 第十一集 Planet Earth S01E11 海洋深处》第 104 行