二级火箭怎么说英语

In Engpsh, a "second stage rocket" or "upper stage rocket" is a rocket that is used to propel a spacecraft or satelpte to its intended destination after the initial launch. This type of rocket typically separates from the first stage, or main rocket, after the initial propulsion phase and is used to provide additional thrust for the final leg of the journey. Second stage rockets are often used in multi-stage launch vehicles, where the first stage provides the initial pft-off and acceleration, and the second stage takes over to complete the ascent to orbit or other desired trajectory.