Just as we can calculate the pH of a substance from it's hydrogen ion concentration, we can calculate the pOH.

就是一种在不同pH值环境中会显现不同化学物质。

But, if the poor creature has lost so much skin from off her back. Poh, poh! That is just one of Tim's large stories.

是，如果可怜家伙背上脱了很多皮。咳，咳！那只是蒂姆编一个故事。