For others, a combination of mass transit and private transportation may be desirable.

而对其他人来说，他们也许想把大众交通和私人交通结合起来使用。

He says public and private transportation should use electric power.

他说公共和私人交通工具应该使用电力。

A study for the Thomson Reuters Foundation shows that safety is the biggest concern for women who use public and private transportation.

汤森路透基金会（Thomson Reuters Foundation）的一项研究显示，乘坐公共或私人交通工具的女性最担心自身安全问题。

I've chosen this particular city planning problem --- our dependence on private transportation to discuss in groups.

我选择了这个特定的城市规划问题——我们对私人交通的依赖来分组讨论。