只有质量的问题，没有品牌的问题。

There is only the problem of quality, not branding.

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只有质量优秀的楼顶大字制作广告材料才不会使楼顶大字制作广告的画布褪色，不会受到气候的影响，才能在经年累月的生活中依然呈现当初的色彩。

Only good quality advertising material would not cause the advertisement canvas to fade, not by the weather to in the long years of life is still showing the original color.

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根据环境保护部对全国338个城市的调查，2016年，只有四分之一的中国城市达到了国家的空气质量标准。

In 2016, only one fourth of Chinese cities met the country's air quality standards, according to a survey of 338 cities nationwide from the Ministry of Environmental Protection.

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And I have purposely made the arrow shorter to indicate that it has been slowed because we are going to argue its mass didn't change, so the only way to change its energy is to change its velocity.

我已经故意将这个箭头弄短,用来象征它变慢了,因为我们将证明它的质量没有变，只有它的能量改变了,也就是它的速度变了。

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