are cut down every year. 被人类砍伐殆尽

219. Across the world's forests,
     世界各地的森林中
220. this story is being repeated endlessly.
     这样的悲剧不断上演
221. 15 billion trees
     每年多达150亿颗树
222. are cut down every year.
     被人类砍伐殆尽
223. Every one of these trees is, in itself,
     每一棵树本身
224. an intricate ecosystem.
     就是一个复杂的生态系统
225. But here in Brazil, they're being replaced
     然而在巴西 取代多样化森林的是

来自《行星地球 第三季 第五集 Planet Earth S03E05 森林》第 222 行