For example, the century-old Rongzhai in Shanghai is the former residence of Rong, the king of flour and the father of China's futures trading.

Take Mrs Rong's bedroom as an example. All four walls are equipped with carved partitions, supported by teak. The floor is staggered by light oak and dark teak boards, which are diagonally connected to form a zigzag pattern. The whole room is full of architectural charm in the late Middle Ages.

Teak is recognized as a valuable wood in the world, and it is the only board that can withstand seawater erosion and sun exposure without bending and cracking. Teak floor is rich in oil and iron, which can prevent moisture and mosquitoes, especially corrosion, even for thousands of years. The wooden floor feels comfortable, elastic and durable. The longer the time, the brighter the color. Teak has a unique fragrance, which can not only prevent snakes, rats and mosquitoes, but also warm people's nerves and help them sleep.