从90年代末开始，这座城市就开始了一场令人诧异的改造。
Starting in the late 1990s, the city underwent a breathtaking transformation.
北京人王志钧在2014年参加马拉松时发现北京空气有些污浊，于是就开始对运动鞋进行改造再利用，自此开始了他的口罩改造之旅。
The Beijing-based creative, Zhijun Wang, first began experimenting with re-purposing sneakers back in 2014 when the former marathon runner noticed the air was not clean.
在设计新的机器或是改造现有机器的时候，最好是从项目的一开始就考虑安全设计。
In the design of new machines or when modifying existing machines, the best is the beginning of a project to consider the safety design.
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