I would like to share with you the following link which is regarding the correct pronounciation of some Chinese words and idioms.  http://www.toutiao.com/a6423534045330718978/

Here again I must point out that people in Taiwan, even some officials and professors, frequently made a mistake when pronouncing "便"宜行事.  It should read "bian" instead of "pian".  BTW, 賈平凹 is a writer, a household name in Chinas Mainland.