C80 New school beauty champion

Unexpectedly, Xu Lang said without thinking, "A paper note can have a maximum of 180 thousand bacteria, and the ones in the top three are Salmonella, Escherichia coli, and staphylococcus. It can be seen how dirty a paper note is."

After Xu Lang finished explaining his answer, Zhang Yu Bo was extremely shocked, because this question was something that he had accidentally seen on his way to work