It marks the end of America's space-shuttle programme, whose last mission is planned to launch on July 8th (see article, article).

它标志着美国太空巴士项目的完结(其最后的使命是计划7月8号发射)。

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Though designed during the 1950s, this rocket-powered research airplane set speed and altitude marks that were not sur-passed until the advent of the shuttle.

虽然它是在50年代设计的，但这种火箭动力飞机的研究标志着它的速度和高度直到航天飞机出现后才超过。

youdao

Though designed during the 1950s, this rocket-powered research airplane set speed and altitude marks that were not sur-passed until the advent of the shuttle.

虽然它是在50年代设计的，但这种火箭动力飞机的研究标志着它的速度和高度直到航天飞机出现后才超过。

youdao