Since the mid-20th century, oil processing technology is developing rapidly, followed by petrochemicals have made significant progress in depth and breadth.
Since the middle of the 20th century, petroleum processing technology has developed rapidly, and with it, petrochemicals have developed greatly in depth and breadth.
Since the middle of the 20th century, petroleum processing technology has developed rapidly, with which petrochemical industry has developed greatly in depth and breadth.<br>