Chapter 502: Please Help, Mr. Advisor

making greenhouses was plastic film, but in this era, plastic could not be produced. Li Chen wasn't a chemical engineer either, so after much deliberation, he could only use copper mirrors that were... a tear and whispered, "Thank you, Your Highness.""Let someone in."Li Chen said something, and immediately someone came quickly from the darkness and knelt outside the pavilion."Take Jiaojiao to rest,...