Over billions of years of evolution, nature has come up with lots of molecular machines, from whip-like flagella that help cells move, to enzymes that catalyze chemical reactions.

在几十亿年的进化过程中，大自然许多分子机，从帮助细胞运动的鞭状鞭毛体到催化学反应的酶。

With green wings outspread, the machine monster was beating swiftly upward through the pillar of purple-blue flame, and close against the crystal tube that contained its brain was Agnes, held fast by the whip-like tentacles of glistening green metal.

绿色的翅膀展开， 机怪物迅速穿过紫蓝色的火焰柱向上攀升，而紧贴着装有它大脑的水晶管旁， 是阿格尼丝，亮绿金属制成的鞭状触手紧紧束缚。

And they wanted to focus on the flagellum because it's that whiplike tail that propels a sperm forward.

霍普金：他们想把重点放在鞭毛上，因为鞭状的尾巴推动精子前进。