And the shape of the tree itself can be changed. "Choose a limb and keep cutting off all the branches and twigs. Wait for it to grow thick and stubby. Then pick a new branch on the limb and treat it the same way.
「把側枝當作主幹看，修剪它上面的分枝，等它長粗；再選它的一枝分枝當作主幹，用同樣的方法養粗。