They provide the only food and water to sustain the family. 嫩叶提供了这个家庭唯一的食物和水

107. Moving from tree to tree is a perilous business.
     在树间跳跃穿梭十分危险
108. Here, nearly all the plants are covered with ferocious spines.
     这里几乎所有的植物表面都布满尖刺
109. His mother searches the tree tops for the youngest leaves.
     幼崽的妈妈在树顶寻找鲜嫩的叶子
110. They provide the only food and water to sustain the family.
     嫩叶提供了这个家庭唯一的食物和水
111. At three months old, the youngster is starting to explore.
     小狐猴三个月大时便开始探索世界
112. All too soon he will have to fend for himself up here.
     很快他将不得不自己上树寻找食物了
113. But it's altogether easier to stay on mother's back.
     但总归还是待在妈妈的背上最轻松

来自《行星地球 第二季 第一集 Planet Earth S02E01 岛屿》第 110 行