base of leaf

例句：

1. 1. The scientist carefully examined the base of the leaf to determine its health status.
   科学家仔细检查了叶子的基部，以确定其健康状况。
2. 2. The tree's leaves are a vital source of oxygen for the ecosystem.
   树叶是生态系统中氧气的重要来源。
3. 3. The plant's growth is closely linked to the base of its leaves.
   植物的生长与叶子的基部密切相关。