C614 It Was Profound and Profound

Xiao Yun tacitly agreed with Tuoba Tian'er's shameless statement.

He thought for a moment.

Then he said, "In terms of the wheels, the wood needed to match a few characteristics. First of all, it can't be easily deformed. Under the pressure of tremendous force, it cannot be deformed and full of holes, and it is not easy to be worn out. It could not move at will