Old car headlights were all the same — which was a fairly bright idea

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延伸阅读 1

密封式大灯把灯丝、反射面等合在同一可更换部件里。换灯时连旧光学面也被更新；标准化选择了哪部分可以一起替换，也限制了车身设计。

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补充字幕原文 2

a standard performance benchmark was established

you’re getting an entirely new headlight every time it goes out