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.
在不同时间间隔内风的持续性对空间飞行器的发射量是很重要的。
The persistence of wind over varying intervals of time is important in the launch of space vehicles.
该零碎应用发射超声波与反射回波时间差来测量待测间隔。
The launch system USES ultrasonic echo and reflection of the time difference to measure the distance test.
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