Its three-wheel design exempts it from onerous federal testing regulations.

它的三轮设计使它不用再受繁杂的联邦机动车测试规定的约束。

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It is very important to prevent fatigue failure, optimize wheel design and secure the safety of rolling stock.

这对预防车轮疲劳失效、优化车轮设计，保障行车安全，具有重要意义。

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Large wheels were developed from a mix of premium lightweight alloys with carbon fiber surrounding the voided areas of the wheel design.

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With a wheel off design and super flywheel, the iPhone connected bike trainer is engineered to produce an ultra-realistic road feel, equivalent to the inertia of an actual rider on the road.

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And the world's first folding wheel won a 2013 Design of the Year Award presented at the Design Museum in London.

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