Hermes is powered by ion engines.

赫耳墨斯由离子发动机驱动。

In Accion's engine these tennis balls are actually ions, and our smallest ion engine is about the size of a pack of cards.

在 Accion 的引擎里，这些网球实际上是离子，而我们最小的离子引擎大约是一副纸牌大小。