求翻译：防晒膜的作用很关键，在对抗阳光[综述 图片 论坛]阻挡紫外线的同时也起到保护隐私的效果。购买防晒膜，最好选择较知名的品牌，一般来说，品质较好的前风挡膜，隔热率可达到45%~55%，阻隔紫外线则能达到95%以上，不过价格偏高，基本不会低于1000元。价格低至三五百元的防晒膜质量难以保证。在挑选时，消费者可以通过手感来辨别，因为防紫外线的车膜中会含有金属层，用手轻揉或轻掸时会发出较为清脆的声音。是什么意思？

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