The noun 火箭 (huǒjiàn) means "rocket" and refers to a vehicle or device propelled by rocket engines. It is commonly used in discussions about space exploration and technology. For example, 月球火箭 means "lunar rocket."
那枚火箭昨天成功发射升空了。
Nà méi huǒjiàn zuótiān chénggōng fāshè shēngkōng le.
That rocket was successfully launched into space yesterday.
工程师们正在测试新型火箭的发动机。
Gōngchéngshīmen zhèngzài cèshì xīnxíng huǒjiàn de fādòngjī.
Engineers are testing the engine of the new rocket.
这是人类历史上最大的运载火箭。
Zhè shì rénlèi lìshǐ shàng zuìdà de yùnzài huǒjiàn.
This is the largest launch vehicle in human history.