- flight would often make the difference between life and death.
飞行往往能决定生死 - More than 300 million years ago,
3亿多年前 - one group of arthropods
一群节肢动物 - were the first creatures to take to the skies.
成为率先上天的生物 - And the evolution of wings
翅膀的进化 - would eventually launch them to global success.
最终将使它们在全球范围内取得成功 - The insects.
昆虫