在实践中，测试要隔好几天才进行一次—间隔时间太长，无法及时检测问题。
In practice, testing occurred only every couple of days - not frequently enough for timely problem detection.
作为空间计划中的飞行器，航天飞机令人失望，它的成本太高，而且发射间隔时间太长。
The space shuttle, the workhorse of the space program, proved to be somewhat of a disappointment, with large cost overruns and long delays.
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