For instance, plastics have a known weakness to ultraviolet rays from the sun, and so long exposure might represent an issue.
例如，塑料有一个缺陷，不能长期暴露于太阳紫外线的照射中。
Researchers believe that these growths are caused in part by long-term exposure to the ultraviolet rays contained in sunlight.
研究者们认为，造成这种增生的一部分原因是长期地暴露于阳光中的紫外线下。
Too much exposure to the sun's ultraviolet rays can cause skin cancer.
过多的太阳紫外线照射可能导致皮肤癌。
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