When it becomes necessary to examine the altitude performance of an aircraft engine, three types of facilities may be used-altitude wind tunnels, altitude test beds and flying test beds.

当需要考察一台航空发动机的高空性能时，可以利用三种型式的设备，即高空风洞、高空试验台和飞行试验台。

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At the same time, the five tailed fox are quarrelling with some aliens about a failed flying test.

此时，五尾狐和几个外星人正为飞行试验的失败而争吵。

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Flying test beds are selected as early flight aircraft for a number of reasons.

选择飞行试验台作为早期试飞的飞机是有很多理由的。

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Flying test beds are selected as early flight aircraft for a number of reasons.

选择飞行试验台作为早期试飞的飞机是有很多理由的。

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