and these forests are bustling with life. 森林中一片生机勃勃的景象

118. Broadleaves are much easier to eat and digest
     阔叶树的树叶更容易食用和消化
119. so now animals can collect their share of the energy that has come from the sun.
     因此动物们也能获得 太阳馈赠给它们的那部分能量
120. It's summer
     现在是夏天
121. and these forests are bustling with life.
     森林中一片生机勃勃的景象
122. But the good times will not last.
     可是好景不长
123. Broad leaves must be shed in winter for their damage by frost.
     由于严寒的原因 阔叶树得在冬天落叶
124. As they disappear,
     树叶消失之后

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 121 行