And relabel the cans with a marking pen to list their contents and any dates when the foods are best used by.

VOA: special.2010.07.19

Take the fattest marking pen you have, scratch that out and replace it with atomic hydrogen.

用你最粗的笔把它划掉，再用氢原子代替它。

麻省理工公开课 - 固态化学导论课程节选