and that long tail helps her balance. 长尾巴能保持身体平衡

188. would have a chance of catching such fragile prey.
     有机会逮住这些羸弱的猎物
189. A female with young makes an easier target.
     一只母羊和几只小羊羔 是最容易下手的目标
190. Her large paws give an excellent grip
     它那宽大的脚爪具备很好的抓地力
191. and that long tail helps her balance.
     长尾巴能保持身体平衡
192. Silently she positions herself above her prey.
     它静悄悄地来到猎物上方
193. She returns with nothing.
     这一次它无功而返
194. Golden eagles patrol these cliffs in search of the weak or injured.
     金雕在悬崖边巡视 搜寻着老弱病残的动物

来自《行星地球 第一季 第二集 Planet Earth S01E02 山地》第 191 行