科技的进步使得人们的生活越来越便利。从最初的塑料到现在的铝合金，材料的变化使得产品的性能得到了显著提升。让我们一起来看看塑料外壳升级的变化。

　　The progress of science and technology has made people's lives more and more convenient. From the initial plastic to the current aluminum alloy, the change of materials has significantly improved the performance of products. Let's take a look at the changes of plastic casing upgrading.

　　塑料外壳升级的变化

　　Changes of plastic casing upgrading

　　70年代，第一代塑料外壳电视机诞生。当时的塑料材质轻巧，易于加工，价格低廉，因此得到了很多人的青睐。电视机的性能虽然不是很好，但是随着科技的进步，塑料外壳的性能也在不断提高。

　　In the 1970s, the first generation of plastic casing television was born. At that time, plastic material was light and easy to process, and the price was low, so it was favored by many people. Although the performance of television is not very good, with the progress of science and technology, the performance of plastic casing is also constantly improving.

　　80年代，塑料材料由于其良好的成本效益和易加工性，得到了越来越多的应用。电视机也逐渐趋于成熟，而且也更加便宜。然而，由于塑料材料的轻质，易碎，容易变形，所以人们对其性能还是持怀疑态度。

　　In the 1980s, plastic materials were used more and more because of their good cost-effectiveness and easy processing. Televisions are also gradually becoming mature, and they are cheaper. However, because of the light weight, fragility and easy deformation of plastic materials, people are still skeptical about their performance.

　　到了90年代后期，随着科技的进步，铝合金材料开始被用于电视机的外壳。铝合金具有较高的强度和刚度，能够有效地防止外壳变形。此外，铝合金性能稳定，耐腐蚀性强，寿命长，所以人们更加喜欢使用铝合金外壳。

　　After the late 1990s, with the progress of science and technology, aluminum alloy materials began to be used in television casing. Aluminum alloy has high strength and stiffness, which can effectively prevent casing deformation. In addition, aluminum alloy has stable performance, strong corrosion resistance and long service life, so people like to use aluminum alloy casing more.

　　随着塑料外壳的改进，我们可以看到它的性能越来越好，寿命越来越长。相信随着科技的进步，塑料外壳的性能会得到进一步提高。

　　With the improvement of plastic casing, we can see that its performance is getting better and better, and its life is getting longer. I believe that with the progress of science and technology, the performance of plastic casing will be further improved.