The push power be produced is very tiny but the key point is that compare to produce same push power ion propulsion needs lesser fuels than traditional rocket.

由此产生的推力非常微小，但关键的一点是，对于产生相同的推力而言离子推进器所需的燃料要比传统火箭少。

youdao

Propulsion and energy systems aren't at the point where Roughead's dream is feasible.

推进和能量系统都还没有达到能实现拉夫黑德梦想的水准。

youdao