the beginning of the boreal forest - 北方森林由此开始

97. and not enough of their energy reaches the ground to enable trees to grow.
    到达地面的能量很少 并不足以支持树木生长
98. You'll need to travel 500 miles south from here before that is possible.
    由此往南500英里的地方 才有可能生长着树木
99. These stunted shrubs mark the tree line -
    这些矮小的灌木标志着森林界线
100. the beginning of the boreal forest -
     北方森林由此开始
101. the taiga.
     这就是泰加林带
102. The needle-shaped leaves of the conifers are virtually inedible
     针叶树的针状树叶根本不能食用
103. so this forest supports very little animal life.
     所以生活在这片森林里的动物非常稀少

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 100 行