watsonxu

Several photos taken very well, almost perfect. I'll share them with you:）

An online charting website

This series of pictures answers this question, and I think it's quite interesting.

This site uses Google's "related sites" feature to show what site is connected to each other. (However, it seems that the support for Chinese is not very good.......

The degradation process of biodegradable plastic bottles. Those who are interested can take a look.