At times, it was monotonous and occasionally nerve-racking, inevitably due to human error, Fredriga said.

这一点，有时是无可避免的会让人觉得单调又伤脑筋的。

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Like when the following vehicle bumped into the leading one and that was just because we forgot, we stopped and we forgot to turn the system off, " Fredriga said."

比如跟随的汽车撞到领路的汽车，而那只是因为我们停下了车但忘了把系统关掉。” 弗雷德里加说。

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