Now, thanks to rigorous protection, the species is recovering. 如今 幸亏制定了严厉的保护 这一物种的数量才得以逐步恢复

139. but no animal is immune to intensive hunting by man
     然而没有哪种动物能够幸免于人类的大捕杀
140. or the destruction of its habitat.
     野牛的栖息地也惨遭破坏
141. And a century ago, the bison were reduced to barely 1,000.
     一百年前 野牛的数量曾锐减至不到一千
142. Now, thanks to rigorous protection, the species is recovering.
     如今 幸亏制定了严厉的保护 这一物种的数量才得以逐步恢复
143. The growing season is long,
     这里的草儿生长期很长
144. and the grass here can support herds all year round.
     能够全年维系所有的动物群落的食物需要
145. Male bison weigh in at one ton.
     公野牛重达一吨

来自《行星地球 第一季 第七集 Planet Earth S01E07 伟大草原》第 142 行