It is crucial that the upper back and neck are held in an erect position to give support for the head.
重要的是：上背和颈部要挺直以支撑头部，这一点很重要。
《柯林斯英汉双解大词典》
3
The neck of four footed animals is usually long, to have them reach their food without difficulty, but the elephant has a short neck, to make him more easily support the weight of his huge head and heavy teeth.