girth of a graph

例句：

1. 1. The girth of the tree is measured by counting the number of leaves on its branches.
   树的周长是通过计算树枝上叶子的数量来测量的。
2. 2. The girth of the rope is important for determining how much weight it can hold.
   绳子的周长对于确定它能够承受的重量很重要。
3. 3. The girth of the balloon is increased by adding more air inside.
   气球的周长通过向里面添加更多的空气来增加。