如果你们不能在车子运行的时候获得能量，那这么做有什么好处？
What's the benefit of doing that, if you cannot harvest energy from every moment when the car is running?
或者这么说好了，为什么要放弃一种公开的朋友关系而选择与朋友有外遇了，这么做有什么好处呢？
Why, in other words, will you be settling for a secret affair with a friend, rather than an open relationship? What does she lack that you don't want to go all the way?
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