I recently ran into this with one of the ideas I've been playing around with prototyping in my spare time the last few weekends.
我最近在实现一个想法时就遇上了这样的事情，这个想法是在过去几个周末的业余时间里，我一直在用原型开发来实验的很多想法中的一个。
We were continually playing with new ideas and trying out models on the test track.
我们不停地试新点子，在试车跑道上试验各种新型号汽车。
We were continually playing with new ideas and trying out models on the test track.
我们不停地试新点子，在试车跑道上试验各种新型号汽车。
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