there are more than a billion insects. 超过人类数量的10亿倍

147. would eventually launch them to global success.
     最终将使它们在全球范围内取得成功
148. The insects.
     昆虫
149. Today, for every human on the planet,
     今天地球上的昆虫
150. there are more than a billion insects.
     超过人类数量的10亿倍
151. They are the most abundant group of animals on Earth.
     它们是地球上数量最多的动物
152. Despite their current success,
     尽管它们如今非常成功
153. the ultimate flying insects first appeared back in the ancient swamps.
     最终能够飞行的昆虫 最早出现在古代沼泽中

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 150 行