Rituparna looked at one branch and estimated the number of leaves on the tree, but Nala was skeptical.

睿都巴若那查看了一根树枝,然后估算了一个总数,但是那勒仍然心存怀疑

耶鲁公开课 - 金融市场课程节选

You have n branches on the tree and you count the number of leaves and sum them up.

一共有n根树枝,你数了叶子的数量然后把他们加起来

耶鲁公开课 - 金融市场课程节选