and silently... 悄无声息地

300. and her target
     选好时机
301. carefully.
     选好目标
302. Slowly
     慢慢地
303. and silently...
     悄无声息地
304. does it.
     展开行动
305. The rivalry between mammals and reptiles
     哺乳动物与爬行动物的竞争
306. has been a feature of life on Earth for hundreds of millions of years.
     数亿年来 一直是地球生命的特点

来自《我们星球上的生命 第一季 第三集 Life on Our Planet S01E03 入侵大地》第 303 行