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最近使用护栏是想让它起到保护的作用，后来随着社会的进步。
Recently, guardrails were used to protect the environment. Later, with the development of society, guardrails were used to protect the environment.
护栏已经不仅仅是起到保护的作用了，还起到了装饰等作用。
Guardrail has not only played a protective role, but also played a decorative role.
在城市的绿化以及环保方面，护栏起到了非常重要的作用。
In the aspect of urban greening and environmental protection, guardrails play a very important role.
不同种类的护栏，它们的作用也是存在区别的。
Different kinds of guardrails have different functions.
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