《黄帝内经·灵枢·五变》
少俞回答说：树木的损伤，主要表现为伤及树枝，如果树枝坚硬刚强就不会被伤害。
少俞答曰：木之所伤也，皆伤其枝。枝之刚脆而坚，未成伤也。
Shao Yu answered: Tree damage is mostly damage to the branches, and if the branches are tough and strong, they will not be damaged.