By comparison, the SLS rocket has specific impulse rates below 500.

相比之下，SLS火箭的比冲率低于500。

Specific impulse is a method for measuring – in seconds –thrust and efficiency levels of rocket engines.

比冲是一种以秒为单位测量火箭发动机推力和效率水平的方法。

Developers of PPR say that in addition to a huge increase in thrust, the new design also provides a " specific impulse" rate of 5,000.

PPR的开发者表示，除了推力大幅增加外，新设计还提供了5000的“比冲”率。