Long gone are the days when mobile phone cases served a purely functional purpose.

手机壳只用于功能性目的的日子早就过去了。

Young people’s environmental awareness has led to a rejection of mobile phone cases made of materials that are difficult to degrade, including plastics.

具有环保意识的年轻人，拒绝使用利用包括塑料在内的难以降解的材料制成的手机壳。