And, of course, the final factor could be testing methodology.
而且，当然，最后的因素应该是测试方法的不同。
The safe testing of vehicle headlamps is an important factor of safe driving.
汽车前照灯的安全检测是保障行车安全的一个重要因素。
Actually, the environmental factor ought to be varying with testing time.
实际上，环境因子应该是随时间变化的变量。
Actually, the environmental factor ought to be varying with testing time.
实际上，环境因子应该是随时间变化的变量。
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