不过，这种估计在国家之间存在显著差异，这取决于包括劳动力结构在内的数个因素。

Such estimates will, however, vary considerably across countries depending on several factors, including the structure of the workforce.

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但是看着在空气动力学、复合结构以及发动机技术上投入的大量研发，很容易让人忘记轮胎仍然是决定赛车性能最重要的因素。

But considering the development effort invested in aerodynamics, composite construction and engines it is easy to forget that tyres are still a race car's biggest single performance variable.

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单层网壳的稳定性能是该种结构设计的主要控制因素，动力稳定是单层网壳稳定性能的主要组成部分。

The stability of single layer shell is the main control factor of its construction design, which the primary proportion is the dynamics stability.

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