The main drawback of the DF-31, apart from the shorter range when compared to the DF-31A, is the lack of an off-road capability.

与东风- 31 A相比除了射程短之外，东风- 31的主要缺点在于缺少非公路的机动能力。

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Off-road capability is further improved by optimization of approach and departure angles, coupled with a generous 225-mm ground clearance.

越野能力已进一步改善的方法和离去角的优化，以慷慨的225毫米的离地间隙耦合。

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But although the road-mobile launcher has some off-road capability, it requires solid ground when launching to prevent damage from debris kicked up by the rocket engine.

然而，虽然道路机动发射装置有一定的越野能力，但在发射时也需要有坚实的地面，以防止火箭发动机激起的碎片造成破坏。

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In automobile terms, it equates to the Toyota Camry in economy, a Lexus in styling, and a Toyota Tacoma in its tough, rough, off-the-road capability.

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The Cayenne is a good example of success in over-engineering: it offers both the (somewhat) added storage utility of a mid-sized SUV, with the pleasant, roomy interior and higher driving position, combined with an astonishing sports-car like driving dynamic (especially in the S, Turbo, and Turbo S models), and, with proper options, phenomenal off-road capability (just watch the publicity video of a Cayenne Turbo S tearing up the sand dunes outside Dubai).

FORBES: Why Do People Like The Porsche Cayenne?

Although technological advances may theoretically permit other effective means of testing the reliability and safety of our stockpile, the demonstration of such capability is still years down the road.

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