然而密歇根大学交通研究所的研究教授PaulGreen对此存有怀疑，这个应用程序是否解决了最大的安全隐患。
However, Paul Green, a research professor at University of Michigan's Transportation research Institute, is skeptical as to whether the app is addressing the biggest safety concerns.
然而密歇根大学交通研究所的研究教授PaulGreen对此存有怀疑，这个应用程序是否解决了最大的安全隐患。
However, Paul Green, a research professor at University of Michigan's Transportation research Institute, is skeptical as to whether the app is addressing the biggest safety concerns.
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