(3) Refining and chemical units have entered the capacity release period. We believe that petrochemical companies usually expand production capacity during the peak period of the petrochemical industry to meet growing demand. After a construction period of 2-3 years, with the release of production capacity and increase in supply, the tense situation between supply and demand has been improved, product prices and price differences have fallen, and the industry's prosperity has declined. According to BP energy statistics, in 2006, 2013-2014, and 2018-2019 after the high points of the previous rounds of prosperity, the growth rate of global refining capacity increased, with an average annual increase of more than 1 million barrels per day.