老化的航天飞机一直存在着许多问题所以最近已经很难成功发射。
The aging shuttle fleet has been fraught with so many problem that it has been difficult to get a successful launch of late.
介绍了复原力、成功老化的概念以及复原力与成功老化的关系。
It introduced the conception of resilience and successful aging, and the relationship between resilience and successful aging.
美国航空航天局新型试验火箭成功发射，该火箭旨在取代老化的航天飞机。
The US space agency (Nasa) has launched a prototype rocket designed to replace the ageing space shuttle.
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