at odd moments
利用零碎时间学习 study at odd moments
“雷德飞潜艇”（RFS-1）是典型的混血儿，它是雷德在业余时间里用其他飞机的零碎部件拼凑成的，正如尤沙科夫的设想一样，它是一架浮力飞行器。
The Reid Flying Submarine (RFS-1) was a true mongrel, constructed by Reid in his spare time using leftover parts from other aircraft and, like Ushakov's design, it was a floatplane.
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