Go along with his plan, and tell the engineer that I will have a chance in three months when I visit the boss again. There are limitations in selecting domestic equipment. When the viscosity exceeds 20 millipascal seconds, the domestic equipment is no longer applicable. The sliding bearing can no longer be lubricated, and at high speed, it wears out in a short time, making it impossible to maintain the dynamic balance of the entire equipment, damaging everything inside. I'll visit the boss then. He won't believe me if I tell him for free. He'll believe after he pays some tuition fees.