The rocket uses liquid propellant, which makes it more environmentally friendly than previous modules.

“长征七号”是一枚采用环保无毒的液氧煤油发动机的大型液体运载火箭，这样就比先前的配置更为环保。

But then you also have a liquid propellant in the form of liquid hydrogen and liquid oxygen.

我们还有液体推进剂，就是液态氢和液态氧。

It's fueled by liquid propellant made of liquid oxygen and kerosene, which is meant to cut down on pollution.

长征六号运载火箭采用液氧煤油发动机以减少污染。