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。
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。
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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