一个大型挡风玻璃雨刷厂的经理，需要估计一下在一般驾驶条件下雨刷平均使用寿命的期望值有多大。

A large manufacturer of windshield wiper blades needs to estimate the mean life users of the blades can expect under typical driving conditions.

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引擎和动力传动系统、刹车系统、底盘、外型、内部以及诸如灯、挡风玻璃雨刷和紧急刹车装置都是关键的组件和子组件。

Engines and drivetrains, braking systems, chassis, exterior, interior, and safety features like lights, windshield wipers, and emergency brakes were key components and subcomponents.

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当然，一些约定成俗和发明使得这样的事件有了发生的可能， 从高速公路代码到挡风玻璃雨刷器及防抱死刹车。

Of course, a host of conventions and inventions have made this state of affairs possible, from the highway code to windscreen wipers and anti-lock brakes.

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