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.

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。

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"What has precipitated the change is an increasing concern over the very variable performance of exam boards, " said a spokesman for the Independent Schools Council information service (Iscis).

BBC: Top schools' concern over exam results

What is more, performance can be much more variable.

BBC: NHS logo

Along with tackling pressure, athletes must also focus on self-confidence, which is the number-one variable for impacting high-level performance.

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