The key is stealth. 狩猎关键在于悄无声息

179. She has ruled this stretch of river for five years.
     她统治这一河段已有五年之久
180. This is her place to hunt.
     这是她狩猎的地方
181. Capybara are strong and wary.
     水豚既强壮又机警
182. The key is stealth.
     狩猎关键在于悄无声息
183. She needs to get within three feet if she's to pounce.
     想袭击它们 她必须靠近到一米之内
184. Not this time.
     这次没成功
185. She's not the only female here.
     她不是这里唯一的母豹

来自《行星地球 第二季 第三集 Planet Earth S02E03 丛林》第 182 行