leaf apex

例句：

1. 1. The leaves of thetree are turning yellow as autumn approaches.
   随着秋天的临近，树叶开始变黄。
2. 2. Thescientist carefully observed the leaf apexto determine the age of the plant.
   科学家仔细观察了叶尖，以确定植物的年龄。
3. 3.The leaf apex is where theplant absorbs sunlight and converts itinto energy.
   叶尖是植物吸收阳光并将其转化为能量的地方。