Small planes are generally costly, loud, require months of training and lots of money to operate, making flying to work impractical for most people.

小型飞机通常都很昂贵，噪音也大，驾驶这种飞机还需要数月的训练和不少资金，这一切都使得“飞去上班”成为大多数人不切实际的幻想。

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It turns out that giving buyers too many choices is impractical and costly for carmakers.

FORBES: Chrysler does the math and concludes that less is more.

You have to find things they want to do, because the more you try to get reluctant countries to do things contrary to their interest, the harder it is, the more costly it is, and therefore the more impractical.

FORBES: Magazine Article