该火箭的第一级是发射航天飞机用的固体燃料火箭的马力加强版；顶端一级是同样增强了马力的用在土星火箭上的J2巨型发动机。

Its first stage is a souped-up version of one of the shuttle's solid-fuel rockets; its top stage is a similarly muscled-up model of the Saturn's massive J2 engines.

youdao

该火箭的第一级是发射航天飞机用的固体燃料火箭的马力加强版；顶端一级是同样增强了马力的用在土星火箭上的J2巨型发动机。

Its first stage is a souped-up version of one of the shuttle's solid-fuel rockets; its top stage is a similarly muscled-up model of the Saturn's massive J2 engines.

youdao