leaf weight ratio

例句：

1. 1. The scientist used the leaf weight ratioto determine the age of the tree.
   科学家使用叶重比来确定这棵树的年龄。
2. 2.The company is using a new leaf weightratio to improve its efficiency.
   该公司正在使用一种新的叶重比来提高其效率。
3. 3.The researcher found that the leaf weightratio was related to the health of theplant.
   研究者发现叶重比与植物的健康有关。