BEIJING, Aug. 21, 2021 /PRNewswire/ -- Sunlands Technology Group (NYSE: STG) ("Sunlands" or the "Company"), a leader in China's online post-secondary and professional education, today announced that it has received a letter from the New York Stock Exchange (the "NYSE") dated July 23, 2021, notifying Sunlands that (i) it is below compliance standards due to the trading price of...